If you wish to apply measured Tsys corrections, you will need to create an
ANTAB file from the various telescope log files. [link to example]
ANTABformat, with Tsys measurements in units of Jy. These should be placed in the ATNF FTP area for each experiment after the session.
GAINgroup of the
ANTABfile should then be set to 1.0 for these telescopes.
ANTABor Tsys, off-source flagging and other log files should be in the ATNF FTP area for the given experiment (linked from the observers wiki page). See the notes on LBA log files.
DPFU, if not provided, should then be set to the nominal DPFU: Tsys(K)/Tsys(Jy) from the table of system parameters.
POLY=1) at all VLBI frequencies. Some other potentially useful gain curves of varying ages are provided in ANTAB format here. Below are two more recent gain curves for Hobart and Ceduna courtesy of S. Ellingsen (2008).
Note these are not in the correct format for ANTAB. They can be converted into a table of values for ANTAB:
Ceduna (at 6.7 GHz, should be OK for 8.4 GHz): 1/[3.8e-5*el^2 - 3.575e-3*el + 0.9165]
Hobart (8.4 GHz): 1/(1.1377-2.5673e-2*el+1.1744e-3*el^2-2.1322e-5*el^3)+1.3452e-7*el^4)
ANTABfile, be sure to edit the antenna names if required, to ensure that the names match with those in the FITS file/AIPS
ANtenna table (usually this will be the two-letter station code, especially for recently correlated data, but should be checked as other antenna names may be used). Also check that the
INDEXkeyword value assigns the columns to the correct IFs/polarizations.
CLtable should correspond approximately to the corrections from
ACCORmultiplied by the square root of nominal SEFD for each telescope, assuming telescope performance is as expected. (This is not true for data correlated pre-2010, in which case the data have been scaled by the nominal SEFD, and the gain amplitudes should be not too far from 1 if the telescope performed at its nominal sensitivity).