[daip] CLCOR bug with GMRT data?

[Eric Greisen]

Andy Biggs wrote:
> Hi there. I've used CLCOR to shift a very bright source in a wide-field map to the phase centre. After running CLCOR, the coordinates in the header match those of the source I've tried to shift so it would appear as if the corrections I entered are correct. However, when I apply the CL table in VPLOT and POSSM, the data look visibly worse. I then inverted the CL table with CLINV and everything then looks as I would expect i.e. the large delay in POSSM and the phase wrapping in VPLOT have both disappeared.
> 
> If the above does indicate some kind of error (other than on my part) is there anything I should send you to help diagnose the problem? This was in 31DEC11 - a midnight job was run last week I think.

I know that the u,v,w sign convention in GMRT is backwards from the rest 
of the world perhaps the issue goes much deeper.  Unfortunatley, the 
GMRT assumes that AIPS will do most of its work and takes no 
responsibility for that.  I don't even have a contact person to ask 
things.  I will take a look.

Eric Greisen