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Introduction Header Keywords Directory Structure Indexing System Versioning CXC Helpdesk	Download the CALDB CALDB Download page (CIAO site) Installation Instructions Release Notes Index File Configurations	Querying the CALDB S-Lang Interface FTOOLS
Calibration Data Chandra Instruments and Calibration "Calibration to CALDB File" pages: ACIS HRC PCAD SIM EPHIN	Proposal Planning ACIS RMFs and ARFs Grating RMFs and ARF PIMMS Effective Areas Chandra Effective Area Viewer	References CALDB Documentation Library CALDB Installation, Maintenance and Use FITS Calibration File Formats/ Conventions

Analysis Notes

Matching CIAO and CALDB Versions

CALDB 4.9.0 should not be used unless you are running CIAO 4.12 or later versions!

Are your versions mismatched? Time to upgrade CIAO and CALDB!

News

Previous Items

17 Dec 2019 [New]

CalDB 4.9.0 has been released. CalDB 4.9.0 is compatible only with CIAO 4.12, and vice versa! Included is an upgrade to the ACIS CalDB bad pixel library, to identify and tag events falling in the ACIS framestore shadow regions as bad pixel events, to be excluded in Level 2 filtering. This applies only to non-CC-mode observations at this point. See the CalDB 4.9.0 Release Notes for details.

17 Dec 2019 [New]

Chandra CfP Cycle 22 proposal planning support data and information have been released, including PIMMS Effective Areas, and model ARFs and RMFs for ACIS Imaging and GRATINGs proposal planning purposes. See the Calibration Proposal Planning web pages for information and access to downloadable files.

07 Nov 2019

CalDB 4.8.5, an upgrade to CalDB 4.8.2 and later versions, has been released. Included is ACIS Contamination Model version N0013, with improved fitting results for ACIS modeling for observations taken since 2018. See the CalDB 4.8.5 Release Notes for details.

13 Sep 2019

CalDB 4.8.4.1, an upgrade to CalDB 4.8.2 and later versions, has been released. Included items are EMERGENCY CORRECTIONS to ACIS T_GAIN bi-epochal periods 75+76 and 77+78, which affect ACIS data sets including chips ACIS-0, 1, 2, 3, or 6 for data sets with DATE-OBS later than 2018-05-02T12:00:00. For the way to determine if your data have been affected, see the CalDB 4.8.4.1 Release Notes.

03 Sep 2019

CalDB 4.8.4, an upgrade to CalDB 4.8.2 and later versions, has been released. Included items are ACIS T_GAIN Epochs 77 + 78 (effective 01 Feb 2019 through 31 Jul 2019), HRC-S Version N0012 time-dependent QEU upgrade files, and HRC-I/S SAMP-based RMF files version N0002. See the CalDB 4.8.4 Release Notes for details.

23 May 2019

CalDB 4.8.3, an upgrade to CalDB 4.8.2 and later versions, has been released. Included items are ACIS T_GAIN Epochs 75 + 76 (effective 01 Aug 2018 through 31 Jan 2019), and HRC-S Version N0011 time-dependent QEU upgrade files. See the CalDB 4.8.3 Release Notes for details.