[daip] [Vlavlbausers] Error in AIPS task FILLM in handling opacities
yoshiaki.hagiwara at nao.ac.jp
Mon Jun 22 07:35:06 EDT 2009
Regarding the problem with FILLM, I wonder if my data(AH979, Observ.
date=03-OCT-2008) are having opacity errors you mentioned below, since
I observed changing frequencies during observations,
>This can make a significant error if one of the
> bands is at relatively high frequency.
In my observations, the difference of frequency change is less than 100
within K-band. Do you think it caused significant errors?
I don't think that my data are affected by the problem
2008-11-05 (水) の 14:15 -0700 に Data Analysts さんは書きました:
> To: All VLA users
> Subject: Error in AIPS task FILLM in handling opacities
> Dear colleague,
> The 31DEC08 (TST) version of FILLM had a problem with its handling of a
> newly available band code in an observation. In the period from September
> 13 to October 20, 2008, FILLM was under the impression that the data it
> was handling were in the band of the new scan rather than the band of the
> scan it still had to finish writing. If your observations were all at
> one band, then there is no problem. If there were band changes during
> the observation then the last record of each scan in CL table version
> 1 will have opacities and antenna gains calculated for the (incorrect)
> band of the next scan. This can make a significant error if one of the
> bands is at relatively high frequency. This error can be repaired most
> simply by deleting all CL tables including version 1 and running INDXR,
> or it can be repaired by using a version of FILLM from a midnight job
> run after October 20, 2008.
> Please contact daip at nrao.edu if you have any further questions about
> the quality of your data.
> Claire Chandler
> Deputy Assistant Director for Science, NM Operations
> Vlavlbausers mailing list
> Vlavlbausers at listmgr.cv.nrao.edu
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