[daip] problem with AP94 data

[Data Analysts]

Hi All,

We will help Martin with this.  Next week we'll
find another dataset with the complete antenna file
and put it on our ftp site.  Thanks for the details, Jim.

Meri


> From julvesta at zia.aoc.NRAO.EDU Fri Jun  7 13:16 MDT 2002
> Sender: julvesta
> Date: Fri, 07 Jun 2002 13:15:57 -0600
> From: Jim Ulvestad <julvesta at aoc.nrao.edu>
> Reply-To: julvesta at aoc.nrao.edu
> Organization: National Radio Astronomy Observatory
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> To: Martin Hardcastle <M.Hardcastle at bristol.ac.uk>, daip at zia.aoc.NRAO.EDU,
>         analysts at zia.aoc.NRAO.EDU
> CC: gvanmoor at zia.aoc.NRAO.EDU
> Subject: Re: [daip] problem with AP94 data
> References: <E17GMbI-0004rM-00 at scorpius.star.bris.ac.uk>
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> Status: RO
> 
> Hi all,
> 
> This has nothing to do with VLA:PT.  FILLM was modified so that
> it always looks for the locations of antennas 1 through 28,
> and always lists PT as antenna 29.  This is true even if
> the data were taken before PT ever existed--antenna number
> 29 is now hard-wired into FILLM.
> 
> The problem is one of errors that were made in creating the
> archive--antennas tables are occasionally missing.
> I found another case earlier this year, at around
> 15-August-1983, and reported it to the proper authorities.
> However, barring someone trying to load the entire archive
> to find such instances, we can only deal with them on
> a case-by-case basis as they show up.
> 
> Below is a copy of a message I sent to the computer division
> head in early January.  It might be useful for the data
> analysts to start keeping a list of the data regions
> where these errors occur.  (That list would at least
> have two entries on it now.)
> 
> EMPHASIS--this is NOT an AIPS problem, but is a data
> archive problem.  The only solution is to run FILLM
> on several files around the offending one until a
> valid antennas table is found.  Then one can delete
> the original AN table from the AP94 data set, and
> copy the correct AN table into AP94.
> 
> Suggested action for this or any other missing AN file.
> 
> (1) Analysts run FILLM on a few files around the one in
> question and look for a valid AN table close to the 
> missing one in time.  Make a note of the range of
> files/times for which correct antenna information is 
> missing.
> 
> (2) Analysts run TASAV on the data set with a valid AN
> table to save all the tables to a  small file.
> 
> (3) Write the file output by TASAV to disk using FITTP.
> 
> (4) Make the disk file available to the astronomer via
> anonymous ftp.
> 
> (5) Astronomer loads the disk file into AIPS using FITLD.
> 
> (6) Astronomer deletes the faulty AN table from his/her
> uv data set, then uses TACOP to copy the correct AN
> table into that data set.
> 
> This all should work--it's what I had to do a few
> months ago.
> 
> jim
> 
> >From - Wed Jan  2 14:26:29 2002
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> Message-ID: <3C337B05.F8B02B9 at aoc.nrao.edu>
> Date: Wed, 02 Jan 2002 14:26:29 -0700
> From: Jim Ulvestad <julvesta at aoc.nrao.edu>
> Reply-To: julvesta at aoc.nrao.edu
> Organization: National Radio Astronomy Observatory
> X-Mailer: Mozilla 4.77 [en] (X11; U; Linux 2.4.2-2 i686)
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> To: gvanmoor at aoc.nrao.edu
> Subject: VLA archive antenna files
> Content-Type: text/plain; charset=us-ascii
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> 
> Hi Gustaaf,
> 
> Based on my sleuthing, Files 32 through 36 (AF70) on
> tape XH83014 have antennas files that say all the
> antennas are "OUT" (at least that's the result from FILLM).
> Others in that vicinity seem okay.
> 
> File 37, also AF70, seems to have a valid antenna file,
> as does File 38.  Prior to AF70, File 30 and 31,
> AS80, seems to have a valid antenna file as well.
> And, this file has the same antenna locations as File 37.
> So I conclude that it's just the 5 files in that immediate
> area that are messed up.
> 
> jim
> Martin Hardcastle wrote:
> > 
> > > Your problem can be related with adding PT antenna to VLA.
> > > I see that output of PRTAN has all antenna name as VLA:OUT but
> > > the 29th antenna name is VLA:VPT.
> > 
> > I did wonder about that...
> > 
> > > Now you can copy the AN table (by the task 'tacop') from your new A-array
> > > observations.
> > 
> > But I need an AN table with the correct antenna positions for B-array
> > in May 1985, or UVFIX still won't work. Right?
> > 
> > If this is a problem with this dataset alone then I thought the
> > analysts might be able to find another observation close to it in time
> > in the archive that I could copy the AN table from...
> > 
> > Martin
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>