[daip] Help!

[Eric Greisen]

Ching-Li Chen wrote:
> Hello!
> 
> 
> I have two questions, and would really appreciate your help.
> 
> 1)
> I was trying to run "CALIB" in order to write the amplitudes and phases for the flux 
> calibrator "3C286" in a new SN table, but the task was stopped because "A CLEAN MODEL WAS 
> REQUESTED FOR MULTIPLE SOURCES."
> 
> I was using a model of the flux calibrator obtained in the CALRD task when running CALIB 
> as I usually do. However, this time CALIB ran successfully only when I don't use the model 
> obtained from CALRD. How do I solve this issue in order to proceed?
> 
> The VLA data set I'm working with is AA0068 B-Configuration at C Band, observed in 1987.
> 

Run LISTR with the SCAN option to see a list of all sources in the 
source table.  I suspect 3C286 is there more than once, perhaps with 
different QUALifiers or CALCODEs.  Specifying which one you want more 
exactly with QUAL and CALCOD may be necessary - or even editing the SU 
table to make the 2 "sources" distinguishable.
> 
> 2)
> What is the best way to run SETJY if the flux calibrator I'm using, "3C273" is an unknown 
> flux calibrator, so I cannot use "CALC" for the OPTYPE parameter?
> 
> The VLA data set I'm working on is AA0080 CD-Configuration at C Band, observed in 1988.

The AIPS CookBook tells about these things in Chapter 4.  Run CALIB on 
3C286, run it on the other calibrators, and then run GETJY which will 
try to determine the flux of the unknown calibrators from that of 3C286 
and the other known calibrators.  If the observing session has none of 
the known calibrators you may not be able to tie your observations to 
any estarblished flux scale.

BTW - it helps to have a better subject line than Help!  That is used by 
African "widows", viagra sales people, etc and is frequently deleted 
from Inboxes automatically or at least without examination.

Eric Greisen