Aug 8, 2019: CASA 5.6.0 is now available for general use. The initial CASA 5.6.0 version does not include any pipelines. The ALMA and VLA pipelines continue to use CASA 5.4.0 (ALMA) and 5.4.2 (VLA).

June 11, 2018: CASA Docs, the official CASA documentation, now includes all tasks descriptions plus general pages on data reduction in CASA.

Obtaining the CASA Release

Supported Operating Systems

The latest CASA release 5.6.0 is available for the following operating systems:

  • Linux
    • Red Hat 7
    • Red Hat 6
  • Mac OS X
    • macOS 10.14 (Mojave)
    • macOS 10.13 (High Sierra)
CASA may also work on other flavors of Linux, but only the operating systems listed above are officially supported by CASA, because these we run regular tests on.

OS X users should be aware that it may be necessary to temporarily bypass Apple's Gatekeeper security system to run CASA for the first time after downloading it. This can be done by using "Ctrl+click" on the downloaded application file and selecting "Open" from the contextual menu. Details can be found here.


Please follow these links for downloading the current release of the code for your specific operating system. Installation instructions are provided, too. Links to previous releases are given at the bottom of this page.
CASA Pre-releases are code under development. Use with caution as the code is still undergoing changes, is less tested and not well documented.

Warning pipeline use: The ALMA and VLA pipelines are included only in certain versions of CASA.
These pipeline-supported versions should not be interchanged for ALMA and VLA
, so ensure to download the correct CASA pipeline version! The latest versions that include the ALMA or VLA pipeline are given below.

ALMA 5.4.0-70 and VLA 5.4.2-5 patches: New patch versions 5.4.2-5 (VLA) and 5.4.0-70 (ALMA) are available for download below. Compared to the original 5.4 releases, these new patches contain a fix to a bug that affected mostly mosaic images with limited number of integrations per pointing, in that the signal-to-noise in the first pointing (typically a corner) could be noticeably higher than in the rest of the image. Details can be found in the CASA Docs 5.4.1/5.4.2 Release Notes and the CASA Docs 5.4.0 Release Notes

CASA Pipelines
CASA Release
CASA Pre-releases
Linux Packages Installation
Red Hat 7
Red Hat 6
Mac OS X Packages Installation
OS X 10.14 (Mojave)
OS X 10.13 (High Sierra)
OS X 10.12 (Sierra)


CASA now collects usage statistics including task execution timings and crash reports. This data will be periodically sent back to NRAO to guide future priorities and decision making. All collection is anonymous and contains no scientific or personal data.

You can disable telemetry by adding the following line in your ~/.casarc file: EnableTelemetry: False
For more information, see CASA Docs

Release Information

The Release Notes and Known Issues of the 5.6.0 release, as well as previous releases, are available in CASAdocs

Hardware Requirements

The reduction of radio data in CASA can be demanding in terms of hardware, and a balanced configuration regarding memory, processing power and file I/O may be required to efficiently run CASA.

Recommendations on the CASA hardware requirements for VLA and ALMA data can be found on the 'Hardware Requirements' pages of CASA Docs.

Older Releases

RedHat 7 (CASA 4.7+)
RedHat 6 (CASA 4.3+)
RedHat 5 (CASA 4.3 - 4.6)
RedHat (CASA <=4.2.2)

MacOS 10.14 (CASA 5.5+)
MacOS 10.13 (CASA 5.3+)
MacOS 10.12 (CASA 5.0+)
MacOS 10.11 (CASA 4.6+)
MacOS 10.10 (CASA 4.4 - 4.7)
MacOS 10.9 (CASA 4.4 - 4.5)
MacOS 10.8 (4.3); OSX 10.8 (<=4.2.2)
MacOS 10.7
MacOS 10.6
MacOS 10.5

Other Links

CASA Source Code -- (Notes).

Contributed CASA scripts

If you need additional help, please consult our NRAO helpdesk or ALMA helpdesk

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