[evlatests] UVW fixed; new archive revision number
Walter Brisken
wbrisken at nrao.edu
Thu Jul 5 16:01:17 EDT 2007
I think the reason left to run UVFIX is if one wants to put new
observations in a similar frame to those of old observations. Calc
certainly supercedes UVFIX's precision. There are some details left to
get right though...
-W
On Thu, 5 Jul 2007, Eric Greisen wrote:
> Ed Fomalont writes:
> > Hi Walter,
> >
> > Thanks for the fix. A related three part question. People often
> > run UVFIX anyway (not for the sign problem over the last few days) to 1)
> > correct for the old VLA time error of 0.5 sample; 2) increase the
> > accuracy of the u,v,w that are computed by the on-line system; 3)
> > correct for the field stretching associated with annual aberration. Are
> > any or all of these previous minor 'errors' now corrected with the
> > on-line uvw and times by mod-comp free, or should UVFIX be run for the
> > wide-field high-precision work anyway?
> >
> > Ed
>
> The format still has the end time - but there has been no reason for
> FILLM to regard that as gospel. Do you have any idea why we have kept
> that absurdity for so long? I am about to put back a new FILLM
> that corrects the time by half the integration time. All data of any
> obs date will be correct henceforth. The issue is documenting this
> change. I don't know about reason 2 even with ModComps...
>
> Eric
>
More information about the evlatests
mailing list