Common Astronomy Software ApplicationsΒΆ

CASA, the Common Astronomy Software Applications, is the primary data processing software for the Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very Large Array (VLA), and is often used also for other radio telescopes.

6.3.0 Release

CASA 6.3.0 can now be (downloaded) for general use. CASA 6.3.0 is available either as a downloadable tar-file, or through pip-wheel installation, which gives flexibility to integrate CASA into a customized Python environment.


  • CASA 6.3 is supported on Mac OS 11 with x86 processors

  • A new task phaseshift supports shifting of the phase center by arbitrary amounts, and replaces the task fixvis.

  • A timerange parameter was added to task tsdimaging

  • The smoothcal task can now smooth calibration tables produced by the accor task.

  • Interactive tclean now works in parallel mode.

  • The savemodel step in tclean has been improved.

  • can now specify most of the startup options.

For more details on these and other new features, see the CASA 6.3.0 (Release Notes).

CASA is developed by an international consortium of scientists based at the National Radio Astronomical Observatory (NRAO), the European Southern Observatory (ESO), the National Astronomical Observatory of Japan (NAOJ), the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), CSIRO Astronomy and Space Science (CSIRO/CASS), and the Netherlands Institute for Radio Astronomy (ASTRON), under the guidance of NRAO.