Version 1.4.9-26

Download ISIS

Current Release

The latest ISIS release is version 1.4.9-26. Source code is available for download from ftp://space.mit.edu/pub/cxc/isis/. Precompiled binaries are available for selected operating systems. Checksums for these files were digitally signed using this GPG public key.

If you wish to use the XSPEC module, it is recommended that you build ISIS from source. Building ISIS from source ensures that the XSPEC module works with your local HEADAS installation.

Installation instructions are included in the distribution in the file INSTALL.txt.

ISIS is written in standard C and Fortran and is intended to be portable across most variants of Unix. It has been used on both 32-bit and 64-bit CPUs and on several versions of Linux, Mac OS X (PowerPC and Intel), Windows (Cygwin), Solaris/SunOS, FreeBSD, DEC OSF1, DEC Ultrix and IBM AIX.

User's Manual

The ISIS user's manual is included in the distribution, and is also available for download in pdf and postscript format.

Spectroscopy Database

If you wish to make use of the APEC spectroscopy database, it is available from http://cxc.harvard.edu/atomdb/

Using the precompiled XSPEC module:

The precompiled binaries above include an XSPEC module which was compiled a recent version of the XSPEC libraries from HEASOFT. To use this precompiled module, you must have a compatible version of the XSPEC libraries locally installed. If you have local XSPEC models which are not included in the HEASOFT distribution, you may wish to compile the module yourself (see below).

Building ISIS from source:

To build ISIS from source, the following packages must be available on your system:

S-Lang is a C-like interpreted programming language, designed to be embedded in C programs to provide extensibility (requires v2.1 or later).
See: http://www.jedsoft.org/slang//download.html.
CFITSIO is a C subroutine library for handling FITS files (requires v3.0 or later for consistency with XSPEC).
See: http://heasarc.gsfc.nasa.gov/docs/software/fitsio//fitsio.html.
PGPLOT is a plotting subroutine library written in Fortran and C (requires v5.1 or later).
See: http://www.astro.caltech.edu/~tjp/pgplot//install.html.

Building the XSPEC module from source:

To build the XSPEC module using the source code provided, you must have a compatible version of the XSPEC libraries installed locally.

If you have local XSPEC models (not included in the HEASOFT distribution), you may wish to use the provided code-generator to automatically generate a custom XSPEC module which matches your local installation. To generate a custom XSPEC module, you must have a local copy of the XSPEC source code.

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This page is maintained by John C. Houck. Last updated: Aug 2, 2008