The CALIB procedure is called ATCALIB. See § 2.2 for some useful information on the procedures. Most of the inputs have the same name as in CALIB; a couple are changed because they are normally poked into those aparm, bparm, cparm or dparm arrays. Obviously, ATCALIB has lost some flexibility compared with CALIB, but it should do what you want for this first calibration (if not, use CALIB). For example, it assumes that the model for each calibrator source is a point source at the phase centre; this is the usual premise for initial calibration (see § 3.1). If there is no flux density in the SU table for a particular calibrator, ATCALIB will assume that 1 Jy is the correct flux density; that is, application of the gains to that source would yield a mean visibility amplitude of 1 Jy. The only source for which you should have a correct flux density in the SU table is the primary calibrator, 1934-638 (see § 5). Later on, you will account for the 1 Jy assumption by comparison with the primary calibrator. This is called boot strapping the flux density scale (see § 9).
Generally, you should set doscalar=-1, but see § 8.3 for a discussion of when this may not be true (bad phase stability).
ATCALIB | |
inname,inclass,inseq,indisk | Fill in for averaged data base |
calsour=' ' | Select sources explicitly or leave blank |
calcode='*' | and use calcodes ('*', 'p' or 's' say) |
freqid=1 | One run of CALIB per freqid is necessary |
timerang=0 | Solve for all time ranges |
antennas=0 | Solve for all antennas |
uvrange=0 | Solve with no uv restrictions or |
specify range in | |
docalib=-1 | No calibration to apply |
flagver=0 | Apply highest version FG table |
refant=3 | Specify the reference antenna |
soltyp=' ' | Least squares algorithm. If too many |
failed solutions, try 'L1' | |
solint=0 | Averaging time in minutes. 0 means scan aver |
doscalar=-1 | Vector average |
minant=3 | Min. no. of antennas to work out a solution |
minamper=5 | Report amplitude errors bigger than 5% |
minpherr=5 | Report phase errors bigger than 5 degrees |
docrt=1 | List results on terminal |
docrt=-1 | List results on printer |