Chandra Announcement: Chandra CalDB version 4.9.8 released

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Tara Gokas

Jun 16, 2022, 4:08:19 PMJun 16
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Chandra CalDB version 4.9.8 released to the public

The CXC announces the public release of Chandra CalDB version 4.9.8. This upgrade includes the following items:

* HRC-I/Grating angle corrections
* HRC-S QEU file set upgrade version N0016
* PCAD ALIGN updates version N0010, a new 18-file set with effective dates 2013-2021 (used in standard data processing, not CIAO)

For details, please see the CalDB 4.9.8 Release Notes located at:

See also "How CalDB 4.9.8 Affects Your Analysis" at

To download and install CalDB 4.9.8 on you system with CIAO 4.14, using the preferred Conda package, see the following link:

Alternatively, to use the ciao-install script to install or upgrade your CIAO 4.14 CalDB to version 4.9.8, please see the following link:

Manual download and installation instructions are also available at

Users who do not wish to download the full CalDB, but would rather access it via the web for their specific observations only, may use the CIAO contributed script "download_obsid_caldb". Note that the web-accessible CalDB may take a day or two to be upgraded to this latest CalDB release.

As always, please send questions and requests for enhancements to the CXC HelpDesk (
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