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
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.
- Fermi Science Tools Updated (13 Feb 2020)
The FermiTools (formerly the SAE) were updated to version 1.2.23 on February 11, 2020. This release includes the NewMinuit package for statistical fitting, adds the PLSuperExpCutoff3 model and provides support for RadialDisk model to ModelEditor, along with bug fixes.
- Re-brightening and decaying of MAXI J1348-630 as observed with NICER (11 Feb 2020)
NICER observations of a new black hole candidate MAXI J1348-630 from Feb. 7 to 10 showed the source declining in X-ray flux by about a factor of 2 during this interval. NICER spectra show that the source is currently in the hard state. NICER will continue monitoring the source about once per day until the outburst fades.
- Initial NICER observations of the mysterious source Swift J0840.7-3516 (aka GRB 200205A) and detection of short X-ray flaring activity (07 Feb 2020)
The source Swift J0840.7-3516 was originally reported as a Gamma-ray burst sourcce by the Swift BAT on February 5. Followup observations by the Swift XRT showed X-ray emission that was inconsistent with a GRB, along with the possible detection of an 8.96 seconds. Followup X-ray observations with NICER showed X-ray flaring during which the X-ray flux increasd by a factor of 4, but did not confirm the X-ray period.
- Updated Million Quasars Catalog (v6.4c) (05 Feb 2020)
The latest version (v6.4c, 31 Dec 2019) of the
(MILLIQUAS) Catalog (Eric Flesch 2009 - 2019)
containing a lot more than one million (1,979,676 to be exact) likely quasars
is now available in both Browse and
- NICER observes a new outburst of V4641 Sgr (04 Feb 2020)
V4641 Sgr is a binary system that contains a 6.4 solar mass black hole which went into X-ray outburst in early January. Observations by NICER on January 31 provided the best measure of the 2-10 keV spectrum and showed an inner disk radius temperature of about 1.5 keV, with no visible features in the power spectrum in the short NICER observation.
- XMMSTACK- XMM-Newton Serendipitous Source
Catalog from Stacked Observations (4XMM-DR9s) Released (03 Feb 2020)
The stacked catalog (XMMSTACK) and associated observation
XMMSTACKOB) offer new versions of the stacked catalog built
from 6,604 4XMM-DR9 overlapping observations. XMMSTACK contains 1,329
stacks (or groups). The catalog contains 288,191 sources, with each
observation also provided in the associated XMMSTACKOB table. Both are
now available in Browse and
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