Common Astronomy Software Applications

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.

6.4.3 Release

CASA 6.4.3 can now be downloaded for general use. CASA 6.4.3 is available either as a downloadable tar-file, or through pip-wheel installation, which gives flexibility to integrate CASA into a customized Python environment.


  • gencal: a new caltype parameter ‘jyperk’ is now available.

  • tclean: mixed polarization setups can now be handled in imaging.

  • flagdata: improvements were made regarding input checks, executing complex commands, and flagging with time or channel averaging.

  • importasdm/exportasdm: parameters ‘showversion’ and ‘useversion’ were deprecated and removed from the task-code and sdm tool.

  • a number of bugs were fixed.

For more details on these and other new features, see the CASA 6.4.3 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.