CASA VLBI 2020 - Introduction to CASA

CASA

CASA : The Common Astronomy Software Applications packages

• Single Dish
• ALMA and VLA
• CASA VLBI

Download

• CASA 6.1 -python3
• CASA 5.7 -python2.7

Data Format

MS : the standard CASA data format

Starting CASA

casa

The output from CASA commands is sent to the file casa-YYYYMMDD-HHMMSS.log.

CASA tasks

Just like tget listobs in aips

CASA <1> : default ('listobs')
CASA <2> : inp

CASA tasks : Python scripts

Standard input

listobs (vis='EXMPL.ms', listfile='EXMPL.listfile')

Outside CASA, using casa -c yourfile.py.

CASA PlotMS

PlotMS

• can diplay X-Y plots of visibility data and calibration tables
• can be started inside a CASA shell or as a stand-alone executable

CASA Viewer

Can display both images and MS file

CASA vs AIPS

CASA calibration tables