Download the HEASOFT Software

Current version 6.21 Release Notes

Before downloading:

All HEASOFT tasks may now be run remotely using the Hera data analysis service at the HEASARC without having to install the software locally. This provides a quick way to try out the software and is ideal for users who have limited or infrequent need to run the HEASOFT tasks. More intensive users of HEASOFT are still encouraged to install the software locally for best performance. Learn more about using Hera.

A download containing all of the package selections can be nearly 4 Gb in size when unpacked; the actual size will vary depending on the packages you select and - if you choose a binary distribution - the architecture selected. If large file sizes present problems for your connection, it is possible to download the packages you want separately and unpack the tar files on top of each other afterwards, though you may need to either rename each tar file with a temporary name during the process or unpack each file immediately upon downloading so that one tar file isn't overwritten by the next.

Please use the interface below to download pre-compiled binaries, or if you wish to select only certain parts of the HEASoft suite for your source code download. For users who want all of the HEASoft source code, here are direct links to two tar file options, one of the complete source code, and one which adds older Xspec model data files:

  • Complete HEASoft source code (all mission & general-use software) (2.0 Gb / 3.6 Gb unpacked); md5 checksum

  • Complete HEASoft source code plus older Xspec model data unneeded by most users (3.0 Gb / 7.1 Gb unpacked); md5 checksum

    STEP 1 - Select the type of software:


    Please note that the source code distribution is recommended - particularly for Linux users - due to portability issues that can affect the pre-compiled binaries. Also, a source code distribution is required for users who wish to use local models in XSPEC / PyXspec.

    Although the source code may be compiled on any supported platform, for project statistics purposes and to help us better serve our users, please indicate the platform(s) on which you intend to compile the HEAsoft source code. If you are uncertain about the version or flavor of your operating system, see the file "/etc/issue" on Linux or use the sw_vers command on Mac OS X.


    PRE-COMPILED BINARY DISTRIBUTIONS (May experience portability issues):

    Please note that the pre-compiled binaries are not recommended - particularly for Linux users - due to Perl portability issues and compiler library portability issues. Also, note that users who wish to use local models in XSPEC or PyXspec must get the source code distribution instead. All binaries are for 64-bit architecture unless noted otherwise below.

    STEP 2 - Download the desired packages:

    Selecting an individual mission package will automatically select a set of recommended general-use tools.


    Please click SUBMIT only once, and be patient while a tar file containing your selections is assembled and retrieved.

    * Xspec Notes:

    STEP 3 - Install the software:

    Help lines: FTOOLS or

    Web page maintained by Bryan K. Irby

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    Last modified: Friday, 19-May-2017 17:04:40 EDT