[daip] New Staff Reply - [!EZG-265803]: Weird data from AT345, 2007Dec12, mix of EVLA and VLA antennas

[Eric Greisen]

New Staff Reply: Weird data from AT345, 2007Dec12, mix of EVLA and VLA antennas

>From the log for your run:

11Dec 9:56:30
Note: It is currently snowing. The snow dump routine was initiated earlier but
there is probably some ice buildup on the antenna dishes. The data is most
likely corrupted.

I have taken a look at these data and most of the calibrator scans
look like pointing failed.  The time from 11:10 to 11:50 has better
cal fluxes for some but not all antennas - the rest of the time the
cal sources are barely detected and CALIB reports failure rates above 50%.
I expect that the operator was right about this particular 4 hours of
data.

The on-line flags table does not show a failure of reference pointing which
was the first theory to explain the very low amplitudes.  But ise in the
dish will do for that.

Eric Greisen


Ticket Details
===================
Ticket ID: EZG-265803
Department: AIPS Data Processing
Priority: Default
Status: Closed
Link:  https://help.nrao.edu/staff/index.php?_m=tickets&_a=viewticket&ticketid=1071