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 4.8.5 installed at the HEASARC (08 Nov 2019)
    The Chandra CalDB 4.8.5 is now installed and available at the HEASARC. Chandra 4.8.5 was released by the CXC on November 7, 2019...
  • NASA's NICER Catches Record-setting X-ray Burst (07 Nov 2019)
    NICER detected an intense burst of X-rays at about 10:04 p.m. EDT on Aug. 20 from a massive thermonuclear flash on the surface of the pulsar SAX J1808.4-3658. This is the brightest burst seen by NICER so far. The burst shows a remarkable two-stage evolution in flux, along with and burst oscillations at the known pulsar spin frequency.
  • NICER Background Estimator Tools (30 Oct 2019)
    Software tools to estimate background in NICER observations are under development, based on analysis of deep NICER exposures of "blank-sky" fields. "Alpha-release" versions of these tools are now available to help NICER observers better estimate backgound in observations and proposals. Understanding of the NICER background is still evolving so the estimates provided by these new tools should be used with caution.
  • NICER detection of two thermonuclear (Type I) X-ray bursts establishes that MAXI J1807+132 hosts a neutron star. (29 Oct 2019)
    NICER has detected two thermonuclear X-ray bursts from the new MAXI X-ray transient MAXI J1807+132, discovered in March 2019. The detection of these bursts show that the system is an LMXB with a neutron star primary.
  • NuSTAR Cycle 6 now Accepting Proposals (25 Oct 2019)
    The NuSTAR General Observer (GO) Program is soliciting proposals for observations during observing Cycle 6. Phase-1 science proposals are due by 4:30 p.m. Eastern Time January 24, 2020. For more information see the NuSTAR Proposal page.
  • Swift CALDB Data updated (23 Oct 2019)
    The Swift SC clock correction file has been updated (CALDB update version 20191017), and the Swift XRT caldb has been updated to version 20190910.

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Last modified: Friday, 21-Jun-2019 15:13:08 EDT

HEASARC support for unencrypted FTP access ended on September 20, 2019. Please see this notice for details.