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Last modified: 3 October 2016

URL: http://cxc.harvard.edu/ciao/news.html

What's New for CIAO 4.8


CIAO Scripts package 4.8.4 released

3 Oct 2016

Version 4.8.4 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Three new scripts have been added:

  • [New] blanksky creates an unscaled blanksky background file compatible with a given event file from an observation, while scaling factors are calculated for each chip and stored in the file header.
  • [New] blanksky_image creates scaled background and background-subtracted images for a given blanksky background file and a reference image.
  • [New] correct_periscope_drift corrects small (~0.1 arcsec) alignment drifts seen over the course of recent, long (>50 ks) observations. Applicable for sub-pixel analysis of bright, on-axis (<2 arcmin) point sources with minimal pileup.

Updates have been made to the scripts:

  • specextract
    • binarfcorr parameter added to explicitly specify detecter pixel size used by PSF correction.
    • Additional checks and warnings added for warm observations.
    • Bug fixed to avoid inadvertent failure when weight=no and mkacisrmf can be used for the observation.
  • srcflux
    • Systems with MARX installed can now use psfmethod=marx to simulate a mono-chromatic PSF that is used for aperture correction.
    • Multiple event files can be used as input, but the results are not merged.
    • The default model and absmodel have been updated to separate the absorption model.
    • A new ${root}_summary.txt file is created with a copy of the final summary information.
  • chandra_repro changed where pix_adj=default for ACIS data in CC-mode will now run acis_process_events with pix_adj=NONE.
  • mktgresp can now create responses for ACIS-I observations with gratings inserted.
  • tgsplit fixed an error when using tgextract2 pha2 files which were created with error=gehrels.
  • monitor_photom script cleaned up to avoid warnings thrown by newer NumPy versions.
  • dax tasks updated to request regions in a specific format.
  • install_marx updated to correct a problem in the auto-generated bash-shell setup script.

CALDB has been updated to v4.7.2

31 May 2016

CALDB version 4.7.2 has been released, retracting the N0005 version of the ACIS grade file introduced in CALDB 4.6.5. This change only affects graded CC-mode observations taken since 2009 November 1. The N0005 grade files mapped the flight grade 66 events as good ASCA grade 2 events in the level 2 events files, but further experience using these events has shown that they only introduce background noise to the resulting spectra in this mode. Subsequently, the previous grade mapping will be used for CC-mode data, where the flight grade 66 events will be filtered out in the level 2 events files.

MARX 5.3 and CIAO Scripts package 4.8.3 released

13 Apr 2016

Version 5.3 of MARX (the Chandra on-orbit simulator) is now available to download. Previous version of MARX (5.0-5.2) contain a bug that affects the PSF for off-axis source simulations. If simulating any source more than 3 arcmin from the aimpoint, please upgrade to MARX 5.3. For details on the issue, see MARX PSF wrong for off-axis sources (#21).

Note that on-axis sources and simulations conducted with SAOTrace or ChaRT are unaffected by this bug.

Version 4.8.3 of the Contributed Scripts and Modules tarfile has also been released; download the updated package from the Scripts page.

A new script, simulate_psf, simplifies the interface to MARX, allowing to simulate a source PSF for an existing observation while using the header information in the file of the existing observation to setup the simulation and projection. The script also supports projection of ChaRT/SAOTrace-generated rayfiles to the detector-plane.

The install_marx has been updated to pick up the latest available version of MARX and specextract has included additional error messages.

[WARNING]
Install MARX on OSX
OSX users should be aware that there continues to be an incompatibility between MARX and the default C compiler, clang affecting both manual and install_marx installations. While MARX compiles successfully with clang, several problematic issues have been seen in the resulting MARX build. The MARX developers suggest using a true gcc compiler, obtainable at http://hpc.sourceforge.net/ for Max OS X, as noted in Known Bugs and Limitations—Max OS X, and setting the appropriate PATH and CC environmental variables.

CALDB has been updated to v4.7.1

25 Mar 2016

CALDB version 4.7.1 has been released has been released with new time-dependent ACIS Gain (TGAIN) files for November 2015-January 2016 (Epoch 64) and updates to the Epoch 63 TGAIN files.

CIAO 4.8.2 Patch released

29 Feb 2016

Download CIAO 4.8.1/4.8.2

CIAO 4.8.2 is only distributed for Mac OS X 64-bit 10.11 (El Capitan) and is identical to the CIAO 4.8.1 patch, with a fix on a bug introduced by the previous patch affecting the OS X 10.11 (El Capitan) pre-compiled build.

Details of the changes that were previously introduced in CIAO 4.8.1 may be found in the CIAO 4.8.1/4.8.2 Release Notes.

CIAO 4.8.1 Patch released

9 Feb 2016

Download CIAO 4.8.1

The primary changes introduced in the CIAO 4.8.1 update are changes to acis_process_events—which fixes a memory allocation issue when handling large data sets that can cause the tool to break—and the upgrade to DS9 7.4. Details of the changes may be found in the CIAO 4.8.1 Release Notes.

CIAO Scripts package 4.8.2 released

27 Jan 2016

Version 4.8.2 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

A new Python model function has been added:

  • [New] sherpa_contrib.utils.renorm changes the normalization of a source model so that the total predicted signal matches the observed data, as an alternative to guessing.

Updates have been made to the scripts and modules:

CIAO 4.8 and CALDB 4.7 released

15 Dec 2015

Read the release notes

Download CIAO 4.8 and CALDB 4.7

CIAO 4.8 is distributed for the following platforms:

  • Linux 64-bit
  • Mac OS X 64-bit 10.11 (El Capitan)
  • Mac OS X 64-bit 10.8 (Mountain Lion) compatible with 10.9 (Mavericks) and 10.10 (Yosemite)

CIAO is no longer available for 32bit Linux operating systems or for older 64bit Linux machines (CentOS 5 era). CIAO is also no longer available for older versions of OSX (notably 10.6 and 10.7). CIAO 4.7 is still available for users who are unable to upgrade. More details on the Platform Support page.

Notable changes and improvements in CIAO 4.8:

Changes in CALDB 4.7.0 include

  • ACIS T_GAIN Epoch 63 Updates
  • ACIS SUBPIX Header Mod for CC-mode
  • ACIS QE for CC-mode Obs_IDs before 01 Nov 2009
  • HRC-I GMAP for 2015-09-27 and Later Observations
  • HRC-I PIBGSPEC for 2015-09-27 and Laer Observations
  • HRC-I BKGRND Event Lists for 2014, 2015
  • PIMMS Cycle 18 Effective Areas

CALDB has been updated to v4.6.9; CIAO Scripts package 4.7.4 released; and introducing ChaRT v2

23 Sep 2015

CALDB version 4.6.9 has been released with new, time-dependent ACIS Gain (TGAIN) files for May-July 2015 (Epoch 62) and updates to the Epoch 61 TGAIN files. Newly generated position-dependent gain maps (DET_GAIN) and corrseponding RMF calibration files (P2_RESP) for the back-illuminated ACIS-S1 have been added, primarily affecting the order-sorting of events in ACIS-S/LETG observations and generated RMFs below 0.5 keV on the S1 chip. The Group F ACIS background files have been also updated, correcting a data type issue that clashed with background files from other groups, triggering warning messages; there is no change in the actual data, otherwise.

For HRC-S/LETG observations, newly calculated line spread functions have been added to the CALDB to improve the signal-to-background ratio in spectral extraction, particularly for narrow region. The change manifests itself in the generated grating RMF. Subsequently, QE calibration files for HRC-S and HRC-I have also been updated since there will be no overall change in the HRC/LETG effective area because changes in the RMFs are compensating changes in the HRC QE, but there are changes of up to ~12% (largest at low-energies) in effective area when the HRC-S or HRC-I are used without a grating.

A new version of the Scripts and Modules Package is also available, fixing a bug in tgsplit affecting CC-mode gratings data and adding several new scripts, including readout_bkg which models the out of time contribution of bright and extended source to the ACIS background. A full list of the new scripts can be found at the scripts history page.

Both updates are available via ciao_install or they can be downloaded individually:

The CXC is also pleased to announce the release of ChaRT v2, an interface to the most recent version of SAOTrace. There have been several changes, most importantly, the ability to account for spacecraft dither which is necessary to perform sub-pixel analysis. A summary of changes and details on preparing a ChaRT simulation are described in: Preparing to Run ChaRT.

CALDB has been updated to v4.6.8 and CIAO Scripts package 4.7.3 released

1 Jul 2015

CALDB version 4.6.8 has been released with new, time-dependent ACIS Gain (TGAIN) files for Febraury-April 2015 (Epoch 61) and updates to the Epoch 60 TGAIN files. Revised ACIS TGAIN files have also been released for the period November 2013-October 2014, primarily affecting data on ACIS-S1 and to a lesser extent, ACIS-I3. Users working with ACIS data taken during these periods, particularly with gratings inserted, may wish to run chandra_repro and reprocess the data to improve the T_GAIN calibration. This release requires CIAO 4.5 or later for full compatibility.

A new version of the Scripts and Modules Package is also available, fixing bugs in combine_spectra and ecf_calc; and adding multi-ObI observation support to merge_obs/reproject_obs/flux_obs.

Both updates are available via ciao_install or they can be downloaded individually:

PSF Central

8 May 2015

Users can now find a collection of information and resources on the Chandra PSF at PSF Central.

It is an active work in progress and we expect to add additional information and links as time goes on.

CIAO Scripts package 4.7.2 released

7 Apr 2015

Version 4.7.2 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Three new scripts have been added:

  • [New] splitobs automates the steps necessary to separate multi-ObI and interleaved-mode observations into individual directories compatible with chandra_repro.
  • [New] gti_align synchronizes the input GTIs to the ACIS exposure boundaries.
  • [New] multi_chip_gti creates a single multi-chip GTI from individual GTIs.

Fixes and updates have been made to the scripts:

  • chandra_repro checks the file names in the primary and secondary directories against the file names in the level 1 event file header. Support added for FAINT_BIAS datasets.
  • specextract has enhanced error and warning messages and better supports preset ardlib parameters.
  • srcflux saves additional per-source data products that is created and used by the script. The spectral model parameters can now take special tokens: %NRAO_NH% and/or %BELL_NH% to replace values reported by the COLDEN tool for the source's location. The per-chip live time is also now used rather than just the LIVETIME value fo the aimpoint chips.
  • mktgresp has three new parameters. The orders parameter allows the creation of responses for an arbitrary set of orders, independent of the input pha2 file; and by default, the responses for different orders are created in parallel, controlled by the parallel and nproc parameters.
  • combine_spectra fixed for a bug when checking that all input files have the same channel grid.
  • coords.chandra Python module includes a new routine to convert from sky(x,y) coordinates to Chandra coordinates.
  • dax spectral analysis fixed to allow for background inclusion.

CALDB has been updated to v4.6.7

23 Feb 2015

CALDB version 4.6.7 has been released has been released with new time-dependent ACIS Gain (TGAIN) files for November 2014-January 2015 (Epoch 60) and updates to the Epoch 59 TGAIN files.

Follow CIAO on Facebook, Twitter, and Google+

21 Jan 2015

Users can now follow CIAO on Facebook, Twitter, and Google+. Topics will include

  • Announce CIAO and CALDB releases, along with other CXC software such as MARX and SAOTrace.
  • Updates when documentation pages are updated: new bugs posted, changes to the analysis threads, updated help files.
  • Various CXC and CIAO related announcements: proposal deadlines, dates for science meetings, changes in platform support, etc.
  • Other items of interest to the CIAO community.

Users are also reminded of the CIAO RSS feed to receive major announcements and of the CIAO YouTube channel with various CIAO and ds9 tutorials and demos.

CIAO 4.7 and CALDB 4.6.5 released

16 Dec 2014

Read the release notes

Download CIAO 4.7 and CALDB 4.6.5

Significant changes in CIAO 4.7 include:

  • This is primarily a maintenance release: bug fixes, supporting new compilers and OTS upgrades.
  • Sherpa now supports stacks of datasets: package for manipulating a stack of related datasets and simultaneously fitting a model to them. It provides stack-enabled (i.e. vectorized) versions of the key Sherpa commands used to load data, set source models, get and set parameters, fit, and plot.
  • Sherpa is also using the newer XSPEC model library version 12.8.2e, and under the hood is making use of more robust library interfaces.
  • CIAO includes version 7.3.2 of SAOImage ds9. Users will notice some changes to the interface. This is discussed more in the watchout page.
  • dmcoords now automatically makes use of the DY_AVG, DZ_AVG, and DTH_AVG keywords in the file headers to correct for the mean SIM drift during an observation. The asolfile parameter is no longer necessary nor required for data processed with ASCDSVER greater than 8.4.2 or has been recalibrated with chandra_repro.
  • There have been several new scripts released since the CIAO 4.6 release, including monitor_photom (generates lightcurve from ACA optical monitor data) and combine_grating_spectra (replaces add_grating_orders and add_grating_spectra). There have also been bug fixes and enhancements of existing scripts.

CIAO Scripts package 4.6.7 released

4 Nov 2014

Version 4.6.7 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Two new scripts have been added:

  • [New] combine_grating_spectra replaces the add_grating_orders and add_grating_spectra scripts to combine spectra from positive and negative grating orders and co-add spectra across multiple observations or sources. The script is compatible with both Type I and II PHA files and will automatically handle response and background files.
  • [New] tgsplit converts a Type II PHA file to a set of Type I source and background PHA files. Positive and negative ordered background spectra are also combined.

Fixes and updates have been made to the scripts:

  • specextract has been fixed to avoid failures when creating an unweighted RMF with a weighted ARF for early mission, warm focal-plane (-110C) observations.
  • combine_spectra has been fixed to avoid failures if any of the background is zero in the same channel as the input spectra when background scaling method is based on counts. Users can also now specify file types not to combine.
  • dax has had several tool names renamed and moved to different menus for clarity. A new Net Counts tool is added to obtain the net counts in each individual region.

CIAO Scripts package 4.6.6 released

24 Sep 2014

Version 4.6.6 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

One new scripts and two new Python modules have been added:

Fixes and updates have been made to the scripts:

  • chandra_repro now creates a FOV file with the other output products and the STATFILT header keyword is added to event files created with 32-bit status.
  • combine_spectra updates the ONTIME/LIVETIME/EXPOSURE keywords in the combined ARF.
  • fluximage, flux_obs, reproject_obs, and merge_obs have been updated with improved error messages and handling of data with missing keywords. Additionally, merge_obs and reproject_obs is updated to only reproject data if the new tangent point is more than 0.05 arcsec away from the current tangent point.
  • specextract has been updated to include a new tmpdir parameter; improved error handling for problems with response creation and corrupt ardlib.
  • srcflux has been updated to include a new tmpdir parameter and binsize hidden parameter to support sub-pixel analysis for small regions.
  • search_csc and obsid_search_csc have corrected MSBS (master source basic summary) column.
  • acis_clear_status_bits fixed for bug affecting 32-bit systems where the CLSTBITS header keyword was being written incorrectly.

XImage-based color lookup-tables have also been updated to contain 256 colors and the bluebase2 lookup-table has been updated to replace invalid values.

CALDB has been updated to v4.6.3

29 Aug 2014

CALDB version 4.6.3 has been released has been released with new time-dependent ACIS Gain (TGAIN) files for May-July 2014 (Epoch 58) and updates to the Epoch 57 TGAIN files. New predictive HRC-S QEU files for 2014-2020 is also added to account for reduction in QE for LETG observations and fixes errors selecting the correct HRC-S QEU files for observations made in 1999 and 2014.

CALDB has been updated to v4.6.2

9 Jul 2014

CALDB version 4.6.2 has been released has been released with new time-dependent ACIS Gain (TGAIN) files for February-April 2014 (Epoch 57) and updates to the Epoch 56 TGAIN files. The contamination model for the optical blocking filter has been updated to version N0009, affecting observations since early-mid 2013, but is otherwise unchanged from the N0008 model introduced in CALDB 4.5.9 for observations made prior to 2013.

CIAO Scripts package 4.6.5 released

12 Jun 2014

Version 4.6.5 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Three new scripts have been added:

  • [New] monitor_photom creates optical light curves from the aspect camera of observations with adat files.
  • [New] summarize_status_bits provides an on-screen summary of the status bits set for rows and their meaning.
  • [New] apply_fov_limits creates and image from an event file bounded by the sky limits of an FOV file.

Fixes and updates have been made to the scripts:

  • srcflux fixed so that background photon flux values in the BG_PHOTFLUX column are correctly calculated, so that the NET_PHOTFLUX_APER and corresponding errors columns are background subtracted.
  • combine_spectra rewritten to make use of Python temporary files and include advanced-user options.
  • fluximage, flux_obs, and merge_obs have been updated to use event file GTIs to calculate an observation's sky area coverage; for HRC-I background subtraction, scaling by particle flux is an option in addition to exposure time.
  • specextract has been updated to better handle multiple aspect solution files for an ObsID and fixed issues with outroots using nested directory paths. Header keywords have been added for galactic HI column densities derived from COLDEN
  • download_chandra_obsid has support added to download evt1a and adat file types.

And a new Python module has been added:

CALDB has been updated to v4.6.1.1

9 Apr 2014

CALDB version 4.6.1.1 has been released fixing an indexing bug only affecting HRC-I analysis using particle background files performed since 2014 March 26, for HRC-I observations taken between 2012 January 01 to 2014 January 01.

CALDB has been updated to v4.6.1 and CIAO Script Package 4.6.3 released

26 Mar 2014

CALDB version 4.6.1 has been released with new time-dependent ACIS Gain (TGAIN) files for November 2013-January 2014 (Epoch 56). Existing HRC-I background files have been upgraded to version N0002, and includes additional files to cover the years 2010-2013, using the latest calibration data. HRC-I and HRC-S RMF file headers have been fixed, where an errant header keyword could cause segmentation faults when using dmcopy with opt=all.

Of particular note, the 2D PSF libraries for ACIS and HRC are retired.

A new version of the Scripts and Modules Package is also available, introducing the ecf_calc script and fixing minor bugs.

  • ecf_calc extracts the encircled counts fraction of a source at a given position as a function of radius.
  • fluximage cleanup behavior changed for handling instrument maps and for HRC-I data with particle background subtraction.
  • chips_contrib.helix module fixed to support more arguments with with the load_colormap_cubehelix() and get_cubehelix() functions.

Both updates are available via ciao-install or they may be downloaded individually:

CIAO 4.6.1 Patch Released

4 Feb 2014

Sherpa has been patched in CIAO 4.6.1 to fix a problem doing analysis in wavelength space (Angstroms) with XSPEC models.

CIAO 4.6 Released

12 Dec 2013

Read the CIAO release notes

Download CIAO 4.6 and CALDB 4.5.9

Notable changes in CIAO 4.6 include:

  • Two new tools have been added to help automate the detection of the 0th order location in grating observations: tg_choose_method and tgdetect2
  • Sherpa template models have been enhanced to include interpolation between the individual table models. Users can now use templates with all the fit methods (previously only gridsearch was valid).
  • The new srcflux script automates the steps necessary to get net counts, rates, and fluxes, with confidence intervals.
  • The ACIS parameter-block filename parameter, pbkfile, in mkarf, mkgarf, mkwarf, eff2evt, and mean_energy_map is no longer used. The information is now encoded in the archived data products created with ASCDSVER 8.4.2 and later or reprocessed with chandra_repro. Users with older data who choose not to reprocess their data, can use the new r4_header_update script.
  • The suite of hotpixel tools: acis_run_hotpix, acis_find_hotpix, and acis_classify_hotpix has been withdrawn from CIAO. The acis_detect_afterglow tool is now the best tool available to identify cosmic ray afterglows without losing a large fraction of events from bright sources.
  • A problem affecting the area calculation when complex regions are selected, has been corrected. This problem affected regions which include multiple overlapping shapes. Simple regions were not affected.

CALDB has been updated to v4.5.9 upgrade

19 Nov 2013

CALDB version 4.5.9 has been released with new ACIS calibration files from an updated QE contamination model that accounts for recent changes in the depth and composition of contaminant on the optical blocking filter. New time-dependent ACIS Gain (TGAIN) files for August-October 2013 (Epoch 55) and a time-dependent HRC-I gain map, and corresponding background PI spectrum for observations, since September 16, 2013 are also included in this release. This release requires CIAO 4.5 or later for full compatibility. The release is available via ciao_install.

Download CALDB 4.5.9

CIAO Scripts package 4.5.5 released

21 Oct 2013

Version 4.5.5 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Minor fixes have been made to the scripts and module:

One new script has been added:

  • [New] list_datasetid will provide the LaTeX dataset identifier macros needed by AAS managed publication.

CALDB has been updated to v4.5.8 upgrade

22 Aug 2013

CALDB version 4.5.8 has been released with new, time-dependent ACIS Gain (TGAIN) files for May-July 2013 (Epoch 54). This release requires CIAO 4.5 or later for full compatibility. The release is available via ciao_install.

Download CALDB 4.5.8

CIAO Scripts package 4.5.4 released

7 Aug 2013

Version 4.5.4 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Significant updates have been made to the scripts:

  • specextract
    • Ancillary files will use the input file header keyword values by default, and look for the files in their standard sub-directories, unless the files are explicitly specified.
    • The correct parameter has been renamed correctpsf
  • chandra_repro
    • The default PI=0:300 filter for non-grating HRC-S data has been removed. Users may apply the DM filter to their input file, if desired.
    • Minor bug fix for when two non-alternating mode event files are found in the secondary/ directory.
    • The creation of the output directory is delayed until the inputs have been verified first.
  • download_chandra_obsid and find_chandra_obsid
    • Limited support of mirror sites added for data download.
  • merge_obs, reproject_obs, and flux_obs.
    • Improved handling of DM filters included with input files.
    • The bands parameter description has been updated, since the low- and high-energy values are required for ACIS data, while they are not used with HRC observations.
  • ahelp documentation added for Python routines used by the scripts, primarily those used by download_chandra_obsid and find_chandra_obsid.

Two new scripts and two Python modules have been added:

CALDB has been updated to v4.5.7 and CIAO Scripts package 4.5.3 released

28 Jun 2013

CALDB version 4.5.7 has been released with new, time-dependent ACIS Gain (TGAIN) files for February-April 2013 (Epoch 53) and a new set of non-CTI-corrected ACIS blank-sky background files (Group F) have been added for back-illuminated GRADED-mode observations. The previously released, CTI-corrected, Group F blank-sky files have been upgraded with pseudo-SKY and -DET coordinates to allow for easier visualization. The T_GMAP files for non-gratings HRC-S data have been fixed, where the time-dependent gain maps will be applied with chandra_repro or hrc_process_events by default, instead of the time-independent gain files.

This CalDB release requires CIAO 4.5 or later for full compatibility. The new CTI files will not be used by CIAO 4.4.1 or earlier.

A new version of the Scripts and Modules Package is also available, fixing a bug in merge_obs when stacks of ancillary files are given.

Both updates are available via ciao_install or they can be downloaded individually:

CIAO Scripts package 4.5.2 released

24 Apr 2013

Version 4.5.2 of the Contributed Scripts and Modules tarfile has been released; download the updated package from the Scripts page.

Significant updates have been made to the scripts:

  • merge_obs, reproject_obs, and flux_obs.
    • Improved handling of HRC data.
    • Event files with OBS_ID keyword of Merged are automatically skipped.
    • Interleaved-mode data can now be combined without explicitly listing e1 and e2 observations.
    • Improved handling of missing ancillary files.
    • The asol argument is checked to make sure an aspect histogram is not used by mistake.
  • chandra_repro
    • Interleaved-mode observations reprocessed without the user needing to split the e1 and e2 observations into separate directories.
    • New recreate_tg_mask parameter added. By default, the existing region appended to the original evt2 file is now used rather than recreated using tgdetect and tg_create_mask.
    • When reprocessing an observation using gratings, the ARF and RMF files for each order and arm are now created. They are saved into a tg sub-directory of the output directory.

Three new scripts have been added:

CALDB has been updated to v4.5.6 upgrade

28 Feb 2013

CALDB version 4.5.6 has been released with new, time-dependent ACIS Gain (TGAIN) files for November 2012-January 2013 (Epoch 52) and a new set of CTI-corrected ACIS blank-sky background files (Group F). New ACIS CTI files have been added for observations taken during the period of 2005 September 16 - 2005 October 15, which was affected by a uncontrolled focal plane temperature. Furthermore, the calibration validity end dates have been reset for a previously unidentified set of five observations, on top of the 38 observations fixed in the CALDB 4.5.0 release. The EVTSPLT and TGAIN file selection are fixed for ObsID 6318.

This release requires CIAO 4.5 or later for full compatibility. The new CTI files will not be used by CIAO 4.4.1 or earlier. The release is available via ciao_install.

Download CALDB 4.5.6

CIAO 4.5 Released

13 Dec 2012

CIAO 4.5 and CALDB 4.5.5 have been released

Read the CIAO release notes and CALDB release notes for detailed information.

Download CIAO 4.5 and CALDB 4.5.5

Notable changes and improvemetns in CIAO 4.5 include:

  • The new tg_findzo tool helps users locate the zeroth order location for heavily piled sources and in the observations that have intentionally masked out the zero order events.
  • Various updates related to creating merged datasets, especially larger mosaics that exceed the standard image sizes. This includes updates to reproject_events and dmmerge to adjust the limits based on the data and to dmextract to keep a consistent definition of BACKSCAL regardless of image size.
  • sherpa updates includes a comprehensive review of how grouping and filtering interact when both source and background datasets are in use. Also, a new sample_flux routine is available to allow users to compute the flux (including unabsorbed) due to a sub-component of a Sherpa model; this functionality has also been made available in the modelflux tool
  • In ChIPS it is now possible annotate plots directly either via the GUI or by right-clicking on plots; text, points, lines, ellipses, boxes, polygon, and even color bars can be added.
  • Numerous bug fixes and enhancements were made to many parts of the system including speed enhancements to wavdetect, fixes to ChIPS clobbering existing files, and Obsvis upgrades for number of allowed CCDs.
  • As previously announced, the mkpsf tool has been withdrawn from CIAO; users should use ChaRT and MARX to simulate 2D models of the point spread function.

Changes in CALDB 4.5.5 include

  • ACIS T_GAIN Epoch 51
  • ACIS time-dependent QEU files version N0007
  • HRC-I GMAP and PIBGSPEC for Sept 2012
  • HRC-S QE versions N0012
  • PIMMS Effective Area CY15 files
  • Header correction for ACIS Group E BKGRND files
  • Header changes to specific ACIS CTI and DET_GAIN files for optimized file selection.

The CIAO scripts package has also been updated for changes in CIAO 4.5. The main changes are:

  • the package is now labelled by a number rather than a date;
  • the check_ctiapp.sh script has been removed as it is no-longer needed (repro-3 is complete)
  • the merge_all, mkBgReg.pl, and mkSubBgReg.pl scripts are deprecated (seethe merge_obs and diffuse emission threads for information on their replacements).

CIAO Scripts Package Updates and CALDB v4.5.3 upgrade

15 Oct 2012

A new version of the Scripts and Modules Package has been released. The main change is the replacement of "merge_all" by merge_obs and reproject_obs, but there are also changes to chandra_repro and the addition of a large number of color look-up tables.

CALDB version 4.5.3 has been released with fixes to the ACIS blank-sky background files released in CALDB version 4.5.2.

Both updates are available via ciao_install or they can be downloaded individually:

CALDB has been updated to v4.5.2

27 Sep 2012

CALDB version 4.5.2 has been released with upgraded ACIS blank-sky background files, as well as new time-dependent ACIS Gain (TGAIN) files for May - July 2012 (Epoch 50). This release is available via ciao-install.

Download CALDB 4.5.2

9th CIAO Workshop First Announcement

22 Aug 2012

The 9th Chandra/CIAO workshop has been scheduled for 22 - 24 April 2013. This three day workshop will feature a series of talks and hands-on sessions for both beginner and advanced CIAO users. Free registration will be required and will open shortly.

CALDB has been updated to v4.5.1

24 Jul 2012

CALDB version 4.5.1 has been released with upgraded HRC-S time-dependent gain maps, to be used in reprocessing observations taken in 2012. This release is available via ciao-install.

Download CALDB 4.5.1

CIAO 4.4.1 released with Sherpa updated to v2, CALDB has been updated to v4.5, and the CIAO Scripts Package has been updated.

27 Jun 2012

Download CIAO 4.4.1, CALDB 4.5, and the Scripts package

The CIAO 4.4.1 release consists of the following changes:

  1. Version 2 of the Sherpa package for CIAO 4.4 has been released. Sherpa v2 provides critical bug fixes related to reading in files and is updated to use XSPEC 12.7.1 models. The following new XSPEC additive models have been also added:

  2. The CIAO tools package has been updated to version 2. The only change made is to update the internal leap-second library used by CIAO.

CALDB version 4.5.0 has been released with a new focal plane temperature upper-limit, as well as new HRC GAPLOOKUP (degap) tables. Furthermore, the calibration validity end dates have been reset for the 38 affected ACIS ObsIDs, listed in the CalDB Caveats page and five HRC ObsIDs affected by similar problems with their GMAP and HRC-S QEU. This release is available via ciao-install.

Download CALDB 4.5.0

A new version of the Scripts and Modules Package has been released; download the updated package from the Scripts page.

  • In chandra_repro, the default value of the check_vf_pha parameter has been changed from yes to no, so that the ACIS VFAINT background-filtering step will no longer be applied to relevant data sets by default. This change was made because the VFAINT filtering is known to remove valid events for sources bright enough to be affected by pile up.

    The auxiliary files - such as bad-pixel, mask, aspect solution - are now copied when the file system does not support soft links. In earlier versions the script would exit with an error in this case.

  • The download_chandra_obsid script can now accept CIAO stack files for its obsids and filetypes arguments.

CALDB has been updated to v4.4.10

30 May 2012

CALDB version 4.4.10 has been released with an upgraded ACIS QE contamination model (version N0007), as well as new time-dependent ACIS Gain (TGAIN) files for Feb - April 2012 (Epoch 49). This release is available via ciao-install.

Download CALDB 4.4.10

CIAO Scripts Package Updates

11 Apr 2012

A new version of the Scripts and Modules Package has been released; download the updated package from the Scripts page.

CALDB has been updated to v4.4.8

23 Feb 2012

CALDB version 4.4.8 has been released with new time-dependent ACIS Gain (TGAIN) files for 01 Nov 2011 - 31 January 2012 (Epoch 48) . This release is available via ciao-install.

Download CALDB 4.4.8

CIAO Scripts Package Updates

16 Feb 2012

A new version of the Scripts and Modules Package has been released; download the updated package from the Scripts page.

  • The find_chandra_obsid script lets you search the publicly-available Chandra observations by position (RA and Dec, J2000) or name (using the CADC name resolver). It is a command-line wrapper for the Chandra Footprint Service.

    A list of matching observations, including relevant information is returned, or the data can be directly downloaded from the archive (download_chandra_obsid can also be used). Examples:

    unix% find_chandra_obsid 'ngc 1333'
    unix% find_chandra_obsid 12:45:32 -32:30:10
    unix% find_chandra_obsid 350.86 58.81 download=ask 
    

    The ciao_contrib.runtool module has been updated to include support for find_chandra_obsid.

  • The combine_spectra script has been updated to:

    1. works around a bug in addresp (no TLMIN4 keyword in the output RMF file) so that combined RMF files can be used in Sherpa and X-Spec;
    2. minor improvements to the handling of temporary files.
  • The fluximage script has been updated to:

    1. support setting badpixfile=NONE if you wish to create an exposure map with no bad pixels;
    2. create all temporary files in the directory given by the tmpdir parameter, so that the script can now be run from a directory in which you do not have write permission;
    3. add a COMMENT line to the headers of the files listing the version of the script that was run (to aid in provenance tracking); for instance:

      unix% dmlist 0.5-7.0_2.3_bin8_flux.img header,clean,raw | grep COMMENT | grep fluximage 
      COMMENT      =  fluximage version 14 February 2012 /                     
      
  • The specextract script has been updated so that it will not error out if you set outroot to be a stack and had correct=yes and weight=no.

  • Two Python modules have been added to support finding (ciao_contrib.cda.search) and downloading (ciao_contrib.cda.data) publicly-available data in the Chandra Data Archive. These modules are used by the find_chandra_obsid and download_chandra_obsid scripts.

  • Two Python modules have been added to support some common coordinate tasks:

    1. coords.resolver provides simple access to the CADC name resolver;
    2. coords.format converts between many sexadecimal and decimal degree formats for Right Ascension and Declination values.

CIAO Scripts Package Updates

6 Feb 2012

A new version of the Scripts and Modules Package has been released; download the updated package from the Scripts page.

  • fluximage:

    • HRC-I background is now correctly filtered before subtraction (the application of the STATUS filter was lost in the update of the script for CIAO 4.4).

      If you have used fluximage with HRC-I data in CIAO 4.4, re-run the script to apply the correct background-subtraction. The fluximage command is recorded in the file header:

      unix% dmhistory ciao44_bin32_thresh.img fluximage
      fluximage infile="hrcf00144N005_evt2.fits" outroot="ciao44"
      binsize="32" bands="::1.1" asolfile="" badpixfile="" maskfile=""
      pbkfile="" dtffile="" normalize="no" expmapthresh="1.5%"
      parallel="yes" tmpdir="/tmp" cleanup="no" clobber="yes"
      verbose="1"
      
    • only perform HRC-I background subtraction if the HRC background CALDB package has been installed.
    • setting badpixfile=CALDB uses the bad pixel file from the CALDB rather than the per-observation version.
    • the HRC-I instrument map is now created with the same binning as the exposure map rather than the native HRC pixel scale.
  • chandra_repro: improved error checking on the input directory.

CIAO Scripts Package Updates

9 Jan 2012

A new version of the Scripts and Modules Package has been released; download the updated package from the Scripts page.

CIAO 4.4 and CALDB 4.4.7 have been released

15 Dec 2011

Read the CIAO release notes and CALDB release notes for detailed information.

Download CIAO 4.4 and CALDB 4.4.7


Last modified: 3 October 2016
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