To find and download HEASARC data in the cloud, you can use astroquery.heasarc or download our new tool, hark.
The HEASARC and NuSTAR teams are greatly saddened by the sudden passing of Katja Pottschmidt. Most recently Katja was the lead scientist for the NuSTAR Guest Observer Facility (GOF), a role she had supported for many years. During her science career she worked on many other high energy astrophysics missions and played an integral role in advancing our knowledge of the universe. She was a wonderful colleague and friend and will be keenly missed by all who knew her.
How to find out more information
XSPEC is distributed and maintained under the aegis of the GSFC High
Energy Astrophysics Science Archival Research Center (HEASARC). It can
be downloaded as part of HEAsoft from
http://heasarc.gsfc.nasa.gov/docs/software/lheasoft/download.html
XSPEC is available either as binaries or source. We recommend downloading the source and compiling locally to avoid potential system library conflicts and allow installation of any patches we release. If you have any problems compiling or running XSPEC please e-mail us at xspechelp@athena.gsfc.nasa.gov
The XSPEC Web page comprises links to the anonymous ftp site, a Web
version of the manual, and several useful documents, including a list
of known bugs. The Web address is
https://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/index.html
with the list of issues and available patches at
https://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/bugs.html
and additional models which can be added at
https://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/newmodels.html
Further useful information can be found on the XSPEC Wiki at
https://asd.gsfc.nasa.gov/XSPECwiki/XSPECPage
and via the XSPEC Facebook group at
https://www.facebook.com/groups/320119452570/