Release Notes CASA 4.5.3

The 4.5.3 CASA version is a secondthird patch to the 4.5.0 CASA release, which is described below, together with the CASA 4.5.0 release notes.

The main feature improvements of CASA 4.5.0 are listed below.

We occasionally issue patches and 'monthly' versions of CASA. To get notified, please subscribe to the 'casa-users' mailing list. 'Monthlies' as well as CASA releases are available at Obtaining CASA. Releases will be announced via the 'casa-announce' mailing list. To subscribe, please visit the mailing lists webpage. For feedback, and help please go to the NRAO helpdesk; for ALMA questions please use the ALMA helpdesk

Note that in its current incarnation CASA is designed to support ALMA, and VLA data, as well as single dish data from ALMA and Nobeyama. Data from other telescopes, be it single dish or interferometers can be imported from uvfits, FITS-IDI , or sdfits formats into measurements sets (ms) or scantables in CASA. Given the variety of non-standard fits formats, we cannot guarantee that CASA will fully support data from all telescopes. However, efforts are made to support data formats from other facilities.

Obtaining the CASA Release

This version of CASA is available from our Download page. There, we also list the supported operating systems.

CASA Release Notes:

CASA 4.5.3 patch: CASA 4.5.3 is a third patch building upon CASA 4.5.2. A fix has been applied for the case when interpolation='nearest' is used for calibrator that is an ephemeris object.

CASA 4.5.2 patch: CASA 4.5.2 is a second patch building upon CASA 4.5.1. The additional changes are mostly affecting the ALMA pipeline, in particular to accommodate updated observing strategies. It also fixes a bug in tclean to create a primary beam when using chanchunks, and addresses some edge cases in plotbandpass.

CASA 4.5.1 patch: The CASA 4.5.1 patch to the CASA 4.5.0 release incorporates a new version of the ALMA data reduction pipeline (see the ALMA pipeline group for details). We fixed a bug in setjy that caused positional offsets when transforming solar system ephemeris data from J2000 to ICRS. We also introduced channel chunking and memory management improvements to tclean.

Valid for CASA Release 4.5.0 and later: The CASA 4.5.0 release emphasized improved stability, robustness, and code refactoring. Many bugs were fixed and development such as parallelization of the calibration steps are being introduced. tclean will eventually replace clean and has underwent a period of intensive testing and improvement. Major feature improvements over the previous version of CASA include:

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