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The HEASARC Calibration Database

Caldb manager: Dr. M. F. Corcoran

The HEASARC's calibration database (CALDB) system stores and indexes datasets associated with the calibration of high energy astronomical instrumentation. The system can be accessed by users and software alike to determine which calibration datasets are available, and which should be used for data reduction and analysis. (Read more...)

User Information

Supported Missions: Missions and Instruments which use the HEASARC CALDB
Find out who's using the CALDB
Remote Access to the HEASARC CALDB
The easiest way to access calibration data from the HEASARC
CALDB Documentation Library
CALDB file format definitions, user guides and more. For quick reference, a table listing the CALDB Header Keywords, with brief definitions, is available.
Cross-Calibration Information
This page contains documents regarding efforts at cross-calibration of X-ray and Gamma-ray instruments.
CALDB Software
Find out what HEASOFT software interacts with the CALDB.
Installing, Managing or Creating your own CALDB
Download the HEASARC CALDB and update it, or make your own CALDB
CALDB Personnel
Who's who at the CALDB (and who was who)
Need Help?
Take a look at the HEASARC Frequently Asked Questions, or use the Feedback page to ask a question.
CALDB Mirror
A mirror of the HEASARC CALDB is available at ftp://cda.cfa.harvard.edu/pub/arcftp/heasarc/caldb/
Latest News

  • Swift SC CALDB updated (08 Jan 2026)
    The Swift SC has been updated to version 20260107 to update the clock correction file to v170 ...
  • NuSTAR Caldb Update (19 Dec 2025)
    The NuSTAR FPM caldb was updated to version 20251215. This release includes a new clock correction file, v219 using a new temperature model. Please see the release notes for more details.
  • Chandra CALDB 4.12.3 installed at the HEASARC (18 Dec 2025)
    The Chandra CalDB 4.12.3 is now installed in and available from the HEASARC CALDB. Chandra 4.12.3 was released by the CXC on December 16, 2025.
  • NuSTAR Caldb Update (03 Dec 2025)
    The NuSTAR FPM caldb was updated to version 20251201. This release includes a new clock correction file, v218 using a new temperature model. Please see the release notes for more details. Also released was NuSTAR caldb version 20251110, which included v217 of the clock correction file.

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    +Caldb News Archive

    +Caldb Mail Archives

    Page author: Michael F. Corcoran
    Last updated: Monday, 21-Apr-2025 17:48:35 EDT.