https://heasarc.gsfc.nasa.gov/ HEASARC Latest News Updates Mon, 10 Aug 2026 08:29:41 -0400 https://heasarc.gsfc.nasa.gov/Images/objects/heapow/current_thumbnail.jpg https://heasarc.gsfc.nasa.gov/ https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/ 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 <a href="https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/docs/release_20260807.txt">release notes</a> for more details. 2851e1030b18dcc6495692779b19a50c Mon, 10 Aug 2026 08:03:00 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/ams-02/ams02rates.html This catalog records the incident rates for all particle species obtained with the Alpha Magnetic Spectrometer (AMS-02) experiment on the International Space Station (ISS), a cosmic ray particle detector installed in May 2011, which covers the energy range of ~0.1 GeV - ~2 TeV. The catalog is available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dams02rates&amp;Action=More+Options">Browse</a> and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=ams02rates">Xamin</a>. 10f5c94ba2f574d610f73025ab7ac4a7 Tue, 04 Aug 2026 13:49:40 -0400 https://heasarc.gsfc.nasa.gov/docs/ixpe/proposals/ixpe_prop.html The due date for IXPE Cycle 4 proposal submission is Sept 17, 2026. Proposals should be submitted via the HEASARC's <a href="https://heasarc.gsfc.nasa.gov/ark/ixpe/">ARK Remote Proposal System (RPS)</a>. For more information about this cycle, please visit the <a href="https://heasarc.gsfc.nasa.gov/docs/ixpe/proposals/c4/propguide.html">IXPE Cycle 4 Guide for Proposals Page</a>. baaf9a23b2cdc68d3a94211c296db15b Tue, 04 Aug 2026 11:00:00 -0400 https://nspires.nasaprs.com/external/solicitations/summary.do?solId={A952E51B-7AD4-B180-2F8C-4E8A79AFFAED}&path=&method=init IXPE Cycle 4 proposers should note that the required one paragraph work plan has been moved to the Non-anonymized Expertise and Resources (E&R) document and should be non-anonymized. Consequently, the page limit for the E&R document has now been increased to 2 pages. For more information, please visit the <a href="/docs/ixpe/proposals/c4/propguide.html">Cycle 4 proposal guide</a>. For any questions about proposal submission and guidelines, please contact the IXPE help desk. e7f546dd7d67c260e1645efe00fcddc3 Thu, 30 Jul 2026 14:47:00 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/chandra/cscstack.html The Chandra Source Catalog's Stacked Observation Detections Table (CSCSTACK) includes 493,236 detections (855,402 total entries consisting of detections plus photometric upper limits) based on 10,034 stacks of X-ray observations. The stacked-observation level allows composite properties to be reported from the co-added observations for detections that would otherwise not be visible or have poor S/N in individual observations, while for higher S/N detections the per-observation properties facilitate analysis of variable sources. The CSCSTACK table is available in Browse and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=cscstack"><b> Xamin</b></a>. 3f9834cd69b979dfc6b934cd6b2109c4 Tue, 28 Jul 2026 11:40:00 -0400 http://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/caldb_wotsnew.html#swift_20260706 The Swift SC has been updated to version 20260702 to update the clock correction file to v173 ... 62cbe52f16d69886669b8419722fbfa6 Mon, 06 Jul 2026 15:10:00 -0400 https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/ The NuSTAR FPM caldb was updated to version 20260630. This release includes a new clock correction file, v230, using a new temperature model. Please see the <a href="https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/docs/release_20260630.txt">release notes</a> for more details. 5ea2eb108827ee6b656687e6a4fe1a6b Thu, 02 Jul 2026 18:03:00 -0400 https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/ The NuSTAR FPM caldb was updated to version 20260630. This release includes a new clock correction file, v230, using a new temperature model. Please see the <a href="https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/docs/release_20260630.txt">release notes</a> for more details. 5ea2eb108827ee6b656687e6a4fe1a6b Thu, 02 Jul 2026 17:03:00 -0400 https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/caldb_wotsnew.html#ixpe_20260629 The IXPE Caldb has been updated for the GPD (version 20260610) and XRT (version 20260609). Downloads are available from the <a href="/docs/ixpe/caldb/">IXPE Calibration page</a>. Users can also access the HEASARC IXPE caldb via <a href="/docs/heasarc/caldb/caldb_remote_access.html">remote access</a>. ac32243a409098c78ab6d6a5331f11dd Mon, 29 Jun 2026 10:16:00 -0400 https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/caldb_wotsnew.html#ixpe_20260629 The IXPE Caldb has been updated for the GPD (version 20260610) and XRT (version 20260609). Downloads are available from the <a href="/docs/ixpe/caldb/">IXPE Calibration page</a>. Users can also access the HEASARC IXPE caldb via <a href="/docs/heasarc/caldb/caldb_remote_access.html">remote access</a>. ac32243a409098c78ab6d6a5331f11dd Mon, 29 Jun 2026 10:16:00 -0400 https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/viewing/viewing.pl The Viewing tool's Sun angle constraint for NuSTAR observations has been updated to reflect the mission's new requirements. b020c4c120566b8ab17571cd74d23927 Wed, 24 Jun 2026 18:01:15 -0400 https://heasarc.gsfc.nasa.gov/cgi-bin/Tools/xTime/xTime.pl A new version of the xTime mission date/time conversion tool has been released that adds support for the IXPE mission and fixes some long-standing issues with converting date/times that correspond to leap seconds and negative MET seconds (for all missions except RXTE and Swift). 84696906b021303aff119d1cd8289073 Mon, 22 Jun 2026 18:42:29 -0400 https://heasarc.gsfc.nasa.gov/docs/ixpe/analysis/#issues Delivery of data from IXPE's Detector Unit 2 (DU2) has resumed. The IXPE team performed an extensive recalibration campaign including 2.7 Ms of exposure on the bright X-ray binary Cyg X-2 in December 2025 and January 2026. The recalibration has successfully restored the polarization and spectral response of DU2. All data since the anomaly in April 2025 have been reprocessed and re-delivered with DU2. Data delivery for new observations now includes DU2. Users are encouraged to compare the results obtained with the different DUs and report any significant discrepancies via the IXPE Help Desk. For more information on the anomaly, please see <a href="https://heasarc.gsfc.nasa.gov/docs/ixpe/friendsofixpe/20260416-Chen.pdf">this presentation</a> by the IXPE SOC. f0a79bcef41c07d3e147c3bb82ec33ce Mon, 15 Jun 2026 12:57:00 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/swift/swiftlsxps.html This table contains the LSXPS catalog of detections by the Swift X-ray Telescope (XRT) used in Photon Counting (PC) mode in the 0.3-10 keV energy range. It is an updated sibling to the previously released 2SXPS catalog. It is now available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dswiftlsxps&amp;Action=More+Options">Browse</a> and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=swiftlsxps">Xamin</a>. 7748b39f25e863e12ee2b3af1b65936d Thu, 11 Jun 2026 18:22:45 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/ams-02/ams02spec.html This catalog records the spectral results obtained with the Alpha Magnetic Spectrometer (AMS-02) experiment on the International Space Station (ISS), a cosmic ray particle detector installed in May 2011, which covers the energy range of ~0.1 GeV - ~2 TeV. The catalog is available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dams02spec&amp;Action=More+Options">Browse</a> and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=ams02spec">Xamin</a>. a45fc46bb9a8239f0007d0777a71991c Thu, 11 Jun 2026 17:42:45 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/all/xmmstackob.html The XMM-Newton Serendipitous Source Catalog: 5XMM-DR15 Stacked Observations Data provides the list of stacks used for the new 5XMM-DR15 catalog (<a href="https://heasarc.gsfc.nasa.gov/W3Browse/xmm-newton/xmmstack.html">XMMSTACK</a>). This catalog is now available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dxmmstackob&amp;Action=More+Options">Browse</a> and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=xmmstackob">Xamin</a>. 7411124aeb9cddf3b48f91937ff28e4d Wed, 10 Jun 2026 15:15:46 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/xmm-newton/xmmstack.html The XMM-Newton Serendipitous Source Catalog: 5XMM-DR15 Full (Stacked) Catalog (XMMSTACK) offers a new version of the stacked catalog built from 14,616 5XMM-DR15 observations, including also non-overlapping observations. XMMSTACK is a complete version of the catalog and has one row per source, followed by subsequent rows with information stemming from each detection or upper limit and thus has 3,397,248 rows. The catalog contains 818,656 unique sources, which are provided in the associated table of source detections, XMM-Newton Serendipitous Source Catalog (<a href="https://heasarc.gsfc.nasa.gov/W3Browse/xmm-newton/xmmssc.html">XMMSSC</a>). Both tables are now available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dxmmstack&amp;Action=More+Options">Browse</a> and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=xmmstack">Xamin</a>. 1d8c142f41edd62e754b7b8de3f89725 Wed, 10 Jun 2026 12:15:46 -0400 https://heasarc.gsfc.nasa.gov/W3Browse/xmm-newton/xmmslewcln.html The updated versions of the XMM-Newton Slew Survey &#34;Clean&#34; and <a href="https://heasarc.gsfc.nasa.gov/W3Browse/xmm-newton/xmmslewful.html"><b>&#34;Full&#34;</b></a> Source Catalogs containing 52,420 and 121,662 X-ray sources, respectively, detected during spacecraft slews are now available in both <a href="https://heasarc.gsfc.nasa.gov/db-perl/W3Browse/w3table.pl?tablehead=name%3Dxmmslewcln&amp;Action=More+Options">Browse</a> Browse and <a href="https://heasarc.gsfc.nasa.gov/xamin/?table=xmmslewcln">Xamin</a>. 9c664043b4c76021e42582f30bce20f8 Wed, 10 Jun 2026 12:05:00 -0400 http://xmmssc.irap.omp.eu/Catalogue/5XMM-DR15/5XMM_DR15.html 14th release of the 4XMM Serendipitous Source Catalogue 795ef39aa7f6158aefe800a429be6a0b Tue, 09 Jun 2026 12:00:00 -0400 https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/ The NuSTAR FPM caldb was updated to version 20260608. This release includes a new clock correction file, v229, using a new temperature model. Please see the <a href="https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/nustar/docs/release_20260608.txt">release notes</a> for more details. 94024e6fe694b7d654be28aa98c12ccc Tue, 09 Jun 2026 10:03:00 -0400