[daip] An AIPS question

[Eric Greisen]

Ray S. Furuya writes:

 > Using VLA archive data which were taken by different
 > PI's by different array configurations, but the same
 > frequency set-up, I'd like to combine these data.
 > 
 > 
 > The problem I have is that I have to shift phase
 > tracking centers of these observations. Of course,
 > I am going to "DBCON" after getting the final
 > calibrated UV data for each slot.  Before doing
 > "DBCON", is there a task to shift source positions ?
 > I've checked the Cookbook, but I could not find it,
 > so I greatly appreciate your help. In my case,
 > I'd like to shift 3 arcsec to combine it with other
 > data.
 > 
DBCON itself will do the shift.  You may have to change from 1950 to
2000 coordinates as well.  UVFIX does this probably better than other
choices.  UVFIX can also shift coordinates.

Eric Greisen