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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.

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Webspec Logo WebSpec is a web interface for the X-ray spectral fitting package, XSPEC. It simulates spectral data for a variety of X-ray missions/instruments. WebSpec can not be used to analyze real data. This page is for the simple interface. More experienced XSPEC users, may want to use an advanced interface which allows up to 9 components. Latest news :
6/24/25Updated AXIS for new baseline.
4/16/25XRISM updated for Cycle 2.

Specify the desired model expression by clicking on a model in each of the scroll boxes and indicating via the checkbox whether you want pileup and/or photoelectric absorption. If you only want one model then click on the top blank line in the second scroll box. When you are ready click the button to set model parameters. To start again click the reset button.


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