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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.

Applying The 6.35.2 Patch To Your Existing 6.35[.1] Installation


    See the HEASOFT 6.35.2 Release Notes for more information about this patch.


  • For users of the source code installation:

    A patch installer script is available to aid you in updating your existing 6.35 source code installation. To use it, simply download the script, save it in the directory containing your existing heasoft-6.35[.1] source code folder, initialize HEASOFT, and then run it: 

      sh hdpatch_6.35.2
    This script will retrieve the necessary patch file (requires wget), then rebuild and re-install all relevant components. Note that any components not included in your original download will be ignored. It may take a while to finish, so please be patient while it runs.


  • For users of a pre-compiled binary installation:

    Choose the appropriate tar file from the list below and unpack it under your existing heasoft-6.35[.1] binary folder.

    PC - Ubuntu Linux
    PC - Fedora Linux
    PC - Red Hat Enterprise Linux



    • If successful, the task fversion should report v6.35.2, nicerversion should report 2025-06-11_V014, Xspec should report v12.15.0d and the task extractor should report v6.19.

    If you have any questions about the information above, please write to us at the FTOOLS help desk.