[daip] AP439: data are not yet on the source

[Leonia Kogan]

Charles,

The following is an analysis of your FILM problem which I carried out yesterday before 
you discovered the pointing error mode.

You write at the morning message:
>So perhaps FILLM finds that some of my science/calibration data is not yet on
>source.

Yes, I arrive to the same conclusion (see the following analysis

Leonid Kogan


John,

I think the scans are skipped because the slew time from the previous 
source end to the skipped source  exceeds
the skipped scan interval:.

The skipped scans are always 1331+305 scheduled after 3C274. This fact 
simplifies the explanation:

I found only one no skipped 1331+305  (#70) scan following 3c264 (#69)
Looking in your attached list I see that  scan #70 starts at 17:32:50 
and FILLM finds it at 17:36:10
The following scan #71 starts later: at 17::37:20

Therefore the slew time from 3c264 to 1331+305 is equal  
17:36:10-17:32:50 = 3:20

All skipped scans have shoter intervals!!!!

#34     16:21:30-16:18:30= 3:00;    
#106    18:48:40-18:51:50=3:10,
#142    20:07:00-20:04:00 =3:00
#175    21:23:30-21:20:20 =3:10

So I  think the data do not have the skipped scans. They are skipped 
because they are too short to exceed the slew time from the previous 
source!!!!  :) 

I want to here your and  other AIPS people before sending this 
consideration to the suffered side (Padget)

Leonia