CASA, the Common Astronomy Software Applications package, is the primary data processing software for the Atacama Large Millimeter/submillimeter Array (ALMA) and NSF's Karl G. Jansky Very Large Array (VLA), and is frequently used also for other radio telescopes. The CASA software can process data from both single-dish and aperture-synthesis telescopes, and one of its core functionalities is to support the data reduction and imaging pipelines for ALMA, VLA and the VLA Sky Survey (VLASS).

Latest CASA Release: 6.7

                • MacOS 26: support for MacOS 26 was added.
                • Intel Macs: CASA 6.7 no longer runs on Mac OS Intel x86 machines.
                • CASA Viewer: the CASA Viewer is no longer packaged with Mac OS (details here).
                • iclean: new interactive clean task, also includes Jupyter Notebook integration.
                • pccor: new task for pulse delay calibration.
                • msuvbinflag: new experimental task to flag outliers in the UV plane.
                • appendantab: new task for appending antab files to an MS.
                • sdimaging: removed from the code, please use tsdimaging instead.
                • simalma/simobserve: new parameter correlator, to control which correlator efficiency is used.
                • antposalma: new parameter firstintegration, to exclude/include data flagged as “firstintegration”.
                • ft: extended list of data selection parameters.
                • antposalma: retry mechanism added for when the web query times out.
                • listcal: now supports fringefit cal tables.
                • Beam Waveguide antenna mount type: added experimental support.
                • hanningsmooth: new parameter smooth_spw for selecting spws to smooth.
                • fringefit: added functionality to combine channels across spectral windows.
                • fringefit: performance has been improved with speedup of FFT stage.
                • sdcal: generates fully flagged calibration solution when OFF_SOURCE data are invalid.
                • sdbaseline: added applying of sinusoid fitting parameters using baseline table.
                • feather/sdintimaging: support added for per-plane beams in feather.
                • importasdm:added support for additional optional ASDM columns.
                • importfitsidi: now labels source positions in the ICRS reference frame (VLBI).
                • atmosphere: ATM (atmosphere) library updated to ALMA Cycle 12.
                • casaconfig: new options and updates available.
                • import/export: “Beam Waveguide” antennas (ALT-AZ+BWG-R/L mount types) now experimentally supported.
                • config files: The configuration files for ngVLA version Rev.F and ALMA Cycle 12 have been added.
                • sdimaging: task sdimaging is deprecated (use tsdimaging instead).
                • tclean: new (experimental) gridder option ‘awp2’ (refactor of awproject).
                • gencal: added support for the output of task getantposalma.
                • fringefit: updated support of corrcomb=’stokes’ (formerly ‘all’) and corrcomb=’parallel’.
                • phaseshift: added multi-field specification of the phasecenter parameter.
                • sdimaging/tsdimaging: proper derivation of weight values for Stokes I.
                • plotbandpass: upgraded to support band-to-band calibration.
                • plotbandpass: plotting of hsd_skycal solutions.
                • plotbandpass: more robust identification of unique solution timestamps.
                • smoothcal: improvements to smoothing of fringefit solutions.
                • msmd.almaspws: identifies ALMA FDM spectral windows with heavy online channel averaging.
                • tclean: initial work to support GPU gridding (not yet available for general use).

                 For details and more, see




CASA is being developed by an international consortium of scientists and software engineers based at the National Radio Astronomical Observatory (NRAO), the European Southern Observatory (ESO), the National Astronomical Observatory of Japan (NAOJ), and the Joint Institute for VLBI European Research Infrastructure Consortium (JIV-ERIC), under the guidance of NRAO.