[daip] [!17215]: AIPS - Regarding OBIT and AIPS: BDFLIST and BDF2AIPS

[Eric Greisen]

Eric Greisen updated #17215
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Regarding OBIT and AIPS: BDFLIST and BDF2AIPS
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           Ticket ID: 17215
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/17215
                Name: Juhi Tiwari
       Email address: j_aquarian_t at yahoo.co.in
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 26 October 2020 08:42 AM
             Updated: 19 November 2020 10:12 AM
           Reply due: 23 November 2020 07:28 AM (3d 21h 16m)
      Resolution due: 12 August 2023 05:00 PM (996d 6h 48m)

1. I did not say that you could not make an image from these data - just that snapshot images from the VLA have bad sidelobes and with only 1 scan poor S/N.
2. I do not use LISTR much any more and so am not familiar with what it says for rms.  An rms of 10 Jy is way way too large.  Why don't you check your calibration with VPLOT (DOTV=1)  or OPTYPE='LIST' in LISTR?  Are the numbers all over the map (as 10 Jy rms would suggest).  Are the numbers for your cal sources reasonably close to the source fluxes?
3. One standard way to see about phase is to compare the scalar and vector averaged amplitudes.  If the source has reasonable S/N, then scalar >> vector means unstable phase.  At L band this is unlikely.
4. The more the merrier - but CLCAL with 2PT simply interpolates the cal scan on either side of the target scan.  But I would recommend also calibrating the calibrators and making images of them to be sure that the calibration and imaging are being done right.
5. Yes the known source is a better cal than the secondary one - use all.
Eric Greisen



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