SSSC1 PURR Log for Stewart Gleadow

Load TDl Script Cattery/Calico/calico-view-ms.py

Can examine a subset of antennas here, but we'll just leave the defaults.

Loading using TDL script Cattery/Calico/calico-view-ms.py

Compile Options: leave as defaults

Selected all data.

Bookmarks > Input visibilities by baseline > spigot:0:5 - spigot:0:8 (used this one specifically to match the displayed values with those shown in the image for SSSC1, but any baselines could be used).

Expanded 'Make an image from this MS'.

Did not get the option to choose lwimager, which is probably because I don't have any other images installed on this particular machine.

Copied in LSM file that was used in creating this MS.

Set to subtract using MeowLSM model. Just subtracting sky model, no residuals or corrections.

Subtracted sky model using LSM, using DATA and storing in CORRECTED_DATA.

Then imaged the residuals, using the 'Make a dirty image' action. Average all channels together in this instance, and create a 512 pixel, 30 arcmin image (shown below).

See lots of structure lefy by the gain errors.

Set up to calibrate the data for receiver gain and phase errors (G-Jones).

Solutions shown match the expected result of slowly varying gain errors, and no phase errors.

Now that we have calculated the G-Jones, try subtracting the sky model and imaging the residuals (should see noise-like structure at a very low level, since we basically have an exact solution here)

Stewart Gleadow gleadows@unimelb.edu.au MWA Software Engineer University of Melbourne