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The High Energy Astrophysics Science Archive Research Center (HEASARC) is the primary archive for NASA's (and other space agencies') missions studying electromagnetic radiation from extremely energetic cosmic phenomena ranging from black holes to the Big Bang. Since its merger with the Legacy Archive for Microwave Background Data Analysis (LAMBDA) in 2008, the HEASARC archive contains data obtained by high-energy astronomy missions observing in the extreme-ultraviolet (EUV), X-ray, and gamma-ray bands, as well as data from space missions, balloons, and ground-based facilities that have studied the relic cosmic microwave background (CMB) radiation in the sub-mm, mm and cm bands.

The HEASARC is a member of the NASA Astronomical Virtual Observatories (NAVO) where we work with other NASA archives to ensure comprehensive and consistent VO access to NASA mission datasets. Users may now query the HEASARC's catalogs using VO-enabled services and specialized tools. This page describes how to get to the HEASARC VO-enabled services and provides information on other HEASARC VO activities.
Latest News
  • Chandra CALDB 4.12.4 installed at the HEASARC (28 Apr 2026)
    The Chandra CalDB 4.12.4 is now installed in and available from the HEASARC CALDB. Chandra 4.12.4 was released by the CXC on April 28, 2026.
  • IXPE Caldb Updated (28 Apr 2026)
    The IXPE Caldb has been updated for the GPD (version 20260424) and XRT (version 20260331). Downloads are available from the IXPE Calibration page. Users can also access the HEASARC IXPE caldb via remote access.
  • IXPE Caldb Updated (28 Apr 2026)
    The IXPE Caldb has been updated for the GPD (version 20260424) and XRT (version 20260331). Downloads are available from the IXPE Calibration page. Users can also access the HEASARC IXPE caldb via remote access.
  • NuSTAR Cycle 12 Targets (15 Apr 2026)
    The list of NuSTAR targets recommended by the Cycle 12 peer review is now available. Cycle 12 observations will start to be routinely performed on June 1, 2026. Evaluations will be sent to all NuSTAR Cycle 12 proposal PIs in the coming weeks.
  • XRISM Caldb Update (15 Apr 2026)
    The XRISM Caldb for the Resolve and XTEND instruments has been updated to version 20260315 (CALDB 13). Tar files can be downloaded from the XRISM Calibration page.
  • NuSTAR Caldb Update (15 Apr 2026)
    The NuSTAR FPM caldb was updated to version 20260407. This release includes a new clock correction file, v226, using a new temperature model. Please see the release notes for more details. In addition, the previous caldb version 20260401, which includes a the clock correction file v225 was also released

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Last modified: Wednesday, 02-Apr-2025 15:14:15 EDT