The "refdate" and "hourangle" keywords can be used in the CASA task simobserve for time specification. Also, one can produce an ms for a full track (e.g. 8 or 12-hour) and then use flagdata to flag specific time ranges prior to imaging the data.
A CASA guide to using the simulation tools is available. More documentation on CASA can be found at the CASA Home Page.
A CASA guide to using the simulation tools is available. More documentation on CASA can be found at the CASA Home Page.