[daip] Question about using AIPS for radio image synthesis {External}

[Eric Greisen]

CLINT is the interval between values in the CL table.  If the calibration
varies rapidly with time, then it should be shorter than 1 minute.  At
your
frequency, the default or 1.05 should be fine.  The reason to use QUACK is
that on some systems the first first data record or two or three are
affected by scan startup issues and have incorrect amplitude or phase
compared to the rest.  Do not use QUACK until you have examined calibrator
source data in detail to see if there are issues at the start and end of
scans.  That examination will show you what values to use for QUACK if
any.

Eric Greisen


> Dear NRAO staffs,
>
>
> Now I am doing task QUACK. However, I don't know what the values of APARM
> in it should be. I will do the cutting at the beginning of each scan, is
> it enough? Or should I do the cutting at the end of each scan also? The
> attached file shows the scan data which I retrieve from task LISTR.
>
>
> Could you mind explain how to do the decision about it also, please?
>
>
> Yours sincerely,
>
> Jedsada Maklai
>
> Research Assistant (by Dr. Ram Kesh Yadav)
>
> National Astronomical Research Institute of Thailand (NARIT)
>
>
> ________________________________
> From: Jedsada Maklai
> Sent: Monday, July 17, 2023 10:20:01 AM
> To: daip at nrao.edu
> Cc: Ram Kesh Yadav
> Subject: Question about using AIPS for radio image synthesis
>
>
> Dear NRAO staffs,
>
>
> I'm using AIPS in order to do the image synthesis. It is radio continuum
> data from GMRT observation at 1260 MHz.
>
>
> The question is, in task FITLD, what is the suitable value for CLINT
> parameter? and why? What is the criteria for justifying the suitable value
> of CLINT in general?
>
>
> (Someone used to suggest me that the suitable value should be 1.05 but I
> don't know the reason. My professor said I should know the reason behind
> this also so I will be able to apply it to other observations in the
> future.)
>
>
> So, could you mind explain it to me, please?
>
>
> Yours sincerely,
>
> Jedsada Maklai
>
> Research Assistant (by Dr. Ram Kesh Yadav)
>
> National Astronomical Research Institute of Thailand (NARIT)
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Eric W Greisen