CALDB Release Notes Version: 2.0 (Released with CIAO 2.0) CALDB Date: 2000-12-04T21:00:00 (4pm EST) CALDB 2.0 on the HEAD LAN is located at /data/CALDB/CALDB_2.0/. It is the default CALDB for CIAO 2.0 on the HEAD LAN. Users need access to the CALDB on their local sites to use CIAO 2.0; unless you are in charge of your own CIAO installation (in which case you will install the CALDB yourself on your own space) you should consult your system manager at your local site for the location of the CALDB you need to use. I. Introduction CALDB 2.0 was released on Monday afternoon, to the CIAO user community. At this point there is a wrinkle in the CALDB updates, because the pipelines are still using CALDB 1.8. That will be updated to 1.8.1 today to include new OSIP files in SDP. See those notes attached to CALDB 1.8 release notes. For the pipelines, an update to CALDB 2.0 will be data-neutral from 1.8.1, since the pipelines use different CALDB files from CIAO for the most part. All that will change will be the index files. For CIAO 2.0, however, CALDB 2.0 represents a welcome and significant change. The ARDLIB and several other CIAO tools in V2.0 now read the CALDB index for files. This means we can update the files in the local CALDB without updating the CIAO software, or adding more and more threads to have users patch in the newer, better CALDB files by hand. This has been made possible because in CALDB 2.0 the index is complete and all-inclusive. The HRMA (AXEFFA, VIGNET), PSF library, grating (RMF, GREFF), FEF, QE, QEU, and region filter files have been included in the index with unique keyword specifications to allow unique selection. Calibration updates are now separated from software updates. Most of these files have been release with CIAO 1.x or from the CIAO ARD web page already; a few exceptions are noted below. If users want to keep using the same files without the updates, they can still pset in the old files, or any calibration files they like, for specific analyses. However, to keep up with the best, most accurate calibration information, all they need to do is to keep their site CALDB installations current with the one CXC (CALCO) maintains. II. New files added to CALDB 2.0: There are some CALDB file updates in CALDB 2.0, however: 1. New HRMA axial effective area 2. New HETG grating efficiencies 3. Newly-added Order-Sorting and Integrated Probability (OSIP) tables 4. New -110C ACIS QEU (uniformity) file The following two items will be released for CALDB 2.0 addition, separately, due to delays in successful testing: 5. New much-awaited meta-FEFs for ACIS 6. ACIS-S/LETG grating RMF's Only the OSIP files affect standard processing, and will be added to CALDB 1.8.1 on 12/5/2000. CALDB 2.0 will be tested off-line in the pipelines before switching the pipelines to it. HRMA axial effective area N0006: Incorporates a superior set of iridium optical constants which eliminates the discontinuities in various energy intervals present in the N0004 file released with CIAO 1.x. This file should spectral line interpretation by removing false features imposed by N0004. Filename: hrmaD1996-12-20axeffaN0006.fits Old file: hrmaD1999-07-22axeffaN0004.fits --> This file has been renamed to hrmaD1996-12-20axeffaN0004.fits, to have the same effective date as the new file. All HRMA calibration files have effective date 1996-12-20T02:57:00, the date of initiation of the XRCF calibrations with the full assembly. The old file has been included in CALDB 2.0, marked as "bad" in the index. Users may select this file by pset-ing each extension to the ardlib.par file. HETG grating efficiencies N0004: Improved gold optical constants near the M-edges. These represent a few precent change in zero and first order from the N0003 file release with CIAO 1.x. Filename: hetgD1996-11-01greffN0004.fits OSIP files: The have been working in the pipelines since August 2000, but their contents have been updated to correct problems with the limits for first order event selection in tg_extract. Users will want to repeat the grating L1.5 and L2 analysis with CIAO tools using these new files. Filenames: acisD1999-07-22osipN0004.fits (-90C) acisD1999-08-13osipN0004.fits (-100C) acisD1999-09-16osipN0004.fits (-110C) acisD2000-01-29osipN0004.fits (-120C) Additionally, the FRACRESP column in the OSIPs has been correct for use in CIAO 2.0 "mgarf". (Not used in CIAO 1.x) The OSIP files are in ARDLIB, so users don't need to select them. There is one file for each ACIS programmatic operating temperature. ACIS -110C QEU: After considerable effort to establish this calibration we are finally able to release the full -110C calibration of the CTI affect on quantum efficiency, valid for each chip and node, version N0002. Filename: acisD1999-09-16qeuN0002.fits The old file, N0001, has been indexed in CALDB 2.0 and marked as "bad". Users may select the old file and pset into ardlib.par if they so choose, but the new one is a better calibration. FEF and GRMF descriptions will be added when the files are released. -- Chandra CALDB Manager