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
  • NuSTAR Caldb Update (03 Sep 2026)
    The NuSTAR FPM caldb was updated to version 20260903. This release includes a new clock correction file, v232, using a new temperature model. Please see the release notes for more details.
  • NuSTAR Caldb Update (03 Sep 2026)
    The NuSTAR FPM caldb was updated to version 20260903. This release includes a new clock correction file, v232, using a new temperature model. Please see the release notes for more details.
  • Swift SC CALDB updated (01 Sep 2026)
    The Swift SC has been updated to version 20260901 to update the clock correction file to v174 ...
  • Additional opportunities to propose for NuSTAR time (19 Aug 2026)
    NuSTAR observing time can be requested through the IXPE Cycle-4 (up to 500 ks; due September 17th) and XMM-Newton Cycle-26 (up to 1500 ks; due October 9th) proposal opportunities.
  • HEASoft 6.37 released (13 Aug 2026)
    HEASoft 6.37 has been released. This includes xspec v13.0, a major upgrade to xspec with many new features, and new and updated mission- specific data analysis software (IXPE, MAXI, NuSTAR, XRISM, etc.) Please see the 6.37 release notes for details.
  • NuSTAR Caldb Update (10 Aug 2026)
    The NuSTAR FPM caldb was updated to version 20260807. This release includes a new clock correction file, v231, using a new temperature model. Please see the release notes for more details.

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