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Welcome to the IRAF Homepage! IRAF is the Image Reduction and Analysis Facility, a general purpose software system for the reduction and analysis of astronomical data. IRAF is written and supported by the IRAF programming group at the National Optical Astronomy Observatories (NOAO) in Tucson, Arizona. NOAO is operated by the Association of Universities for Research in Astronomy (AURA), Inc. under cooperative agreement with the National Science Foundation

IRAF V2.15.1a Release Patch Now Available

(Updated February 21, 2011)

An IRAF v2.15.1a Patch release is now available from the IRAF anonymous ftp archive at

ftp://iraf.noao.edu/iraf/v215/PCIX/

The earlier v2.15.1 patch introduced a new bug for real FITS images

In addition, several application-specific bugs that have been discovered since the v2.15.1 release are also fixed, however the minor version increment reflects what we consider to be a minor change to the v2.15.1 release.

Details of this patch and upgrade instructions may be found in the release announcement.

IRAF V2.15.1 Release Patch Now Available

(Updated January 25, 2011)

An IRAF v2.15.1 Patch release is now available from the IRAF anonymous ftp archive at

ftp://iraf.noao.edu/iraf/v215/PCIX/

Potential Data Corruption on 64-bit Systems
Support for Double-Precision FITS images on 64-bit Systems
Remove License Restrictions from the XYACC Compiler
Backward-Compatability for NHEDIT tasks

Details of this patch and upgrade instructions may be found in the release announcement.

IRAF V2.15 Release Now Available

(Updated November 21, 2010)

The release of the IRAF V2.15 system (featuring 64-bit platform support) is now available from NOAO. This release covers both 32- and 64-bit Linux and Mac OSX systems (Intel and PPC) and is now recommended for all users and developers. Modified sources for some 30 external packages which have been ported to 64-bit are also available from the FTP archive extern directory. Support for additional platforms and updated external package distributions will be made available in the coming weeks.

IRAF v2.15 is now distributed as a single-file download for each supported platform. Installation is now just a matter of unpacking this single tarfile and executing the iraf install script. Similarly, v2.15 also features a new external package mechanism to automate the download and installation of packages. A full list of features and changes is detailed in the Release Notes.

IRAF v2.15 Distribution Files:

Documentation:	Release Notes	Install Guide	Site Mgrs Guide
	v2.15 Revisions	64-bit Porting Guide
Downloads:	Linux 32-bit (66MB)	Mac OSX 32-bit (131MB)	Release Directory
	Linux 64-bit (112MB)	Mac OSX 64-bit (69MB)	ExtPkg Directory
	Combo Linux 32/64-bit (149MB)	Combo OSX 32/64-bit (170MB)
	Source-only (29MB)	All Platforms (290MB)

This release include a unified linux architecture suitable for all 32-bit Linux distributions. Similarly, the macosx architecture is now a Universal (Intel and PPC) 32-bit distribution. On 64-bit linux platforms the architecture name is linux64, the macinte architecture name now refers explicitly to 64-bit OSX (Intel). Despite the architecture name changes, older external packages can continue to be used (see the Release Notes and 64-bit Porting Guide for details).

24-Bit XImtool Now Available

(Updated September 1, 2009)

The X11IRAF v2.0 release featuring XImtool support for 24-bit displays is now available as for general use from the following URLs:

Source Distribution:
    http://iraf.noao.edu/x11iraf/x11iraf-v2.0BETA-src.tar.gz

Pre-built Binaries:

    http://iraf.noao.edu/x11iraf/x11iraf-v2.0BETA-bin.redhat.tar.gz
    http://iraf.noao.edu/x11iraf/x11iraf-v2.0BETA-bin.macosx.tar.gz
    http://iraf.noao.edu/x11iraf/x11iraf-v2.0BETA-bin.macintel.tar.gz

Limited internal-testing has shown this package is stable enough for wider testing within the user-community, however it should be remembered this is a first release and some problems and platform-specific issues might still be found. Known issues (and existing features for those not familiar with XImtool) are outlined in the release notes available at

        ftp://iraf.noao.edu/iraf/x11iraf/Notes-V2.0.html
        ftp://iraf.noao.edu/iraf/x11iraf/Notes-V1.3.html

This release provides only the existing X11IRAF applications with 24-bit X11 display support. See the Notes-V2.0 document above for detailed changes.

IRAF Support at iraf.net

Discussions have been underway for a while within NOAO regarding how best to balance the needs of internal projects, the iraf.net support activities, and new projects. The result is a mutual collaboration in which IRAF development is resuming within NOAO on a modest scale, and the community support and development activities at iraf.net will be encouraged and supported for those NOAO employees supporting the site.

User support remains the primary responsibility of iraf.net. Users are encouraged to Register at that site post questions to the forums. These forums also serve as a searchable online archive of all email sent to the old iraf helpdesk.

Past Features:

Host CL Scripting Capability	Image Display from Host Programs
GUI Applications Package	SYSINFO Diagnostic Tool
April 1998 IRAF Newsletter	Test Your IRAF Knowledge

What is it? How do I get it?

IRAF is the "Image Reduction and Analysis Facility". The main IRAF distribution includes a good selection of programs for general image processing and graphics, plus a large number of programs for the reduction and analysis of optical and IR astronomy data (the "noao" packages). Other external or layered packages are available for applications such as data acquisition or handling data from other observatories and wavelength regimes such as the Hubble Space Telescope (optical), EUVE (extreme ultra-violet), or ROSAT and AXAF or Chandra (X-ray). These external packages are distributed separately from the main IRAF distribution but can be easily installed. The IRAF system also includes a complete programming environment for scientific applications, which includes a programmable Command Language scripting facility, the IMFORT Fortran/C programming interface, and the full SPP/VOS programming environment in which the portable IRAF system and all applications are written.

IRAF is freely available on all platforms via anonymous ftp to our server at iraf.noao.edu. If you are unsure about whether IRAF can help you, we have a FAQ (frequently-asked questions list) to answer this particular question.