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Alice Curtin <alice.curtin@mail.mcgill.ca> </td>
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• Jane Kaczmarek <jane.kaczmarek@gmail.com><br>
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Awaiting Agent
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To whom this reaches, I am analyzing the data from observation BK235G2 (occurred on July 13 2021). I am having difficulty with our bandpass calibration, and am hoping to get some help o...
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<div>To whom this reaches,</div><div><br></div><div>I am analyzing the data from observation BK235G2 (occurred on July 13 2021). I am having difficulty with our bandpass calibration, and am hoping to get some help on it! </div><div><br></div><div>I am attaching two plots of the uv coverage of this observation for the phase calibrator 'J1935+8130'. One of the images (that with the most uv coverage) is that pre-bandpass calibration, while the other is that post-bandpass calibration. The bandpass calibration seems to be eliminating the middle part of our uv coverage plot by flagging all of the data for antenna 6.</div><div><br></div><div>To perform bandpass calibration, I use <i>vlbabpss, </i>with the following inputs:</div><pre>Code for VLBABPSS:<br>AIPS 1: VLBABPSS Procedure to create BP table<br>AIPS 1: Adverbs Values Comments<br>AIPS 1: ----------------------------------------------------------------<br>AIPS 1: INNAME 'G2_PULS_3IF' Input UV file name (name)<br>AIPS 1: INCLASS 'UVCOP' Input UV file name (class)<br>AIPS 1: INSEQ 1 Input UV file name (seq. #)<br>AIPS 1: INDISK 1 Input UV file disk unit #<br>AIPS 1:<br>AIPS 1: Data Selection<br>AIPS 1: CALSOUR 'J1331+3030' Bandpass calibrator sources.<br>AIPS 1: *rest ' '<br>AIPS 1: CALCODE ' ' Calibrator code ' '=>all<br>AIPS 1: TIMERANG *all 0 Time range to select<br>AIPS 1: ANTENNAS *all 0 Antennas to select<br>AIPS 1:<br>AIPS 1: CLEAN map (optional)<br>AIPS 1: IN2NAME ' ' Cleaned map name (name)<br>AIPS 1: IN2CLASS ' ' Cleaned map name (class)<br>AIPS 1: IN2SEQ 0 Cleaned map name (seq. #)<br>AIPS 1: IN2DISK 0 Cleaned map disk unit #<br>AIPS 1: INVERS 0 CC file version #.<br>AIPS 1: NCOMP *all 0 # comps to use for model.<br>AIPS 1: 1 value per field<br>AIPS 1: FLUX 0 Lowest CC component used.<br>AIPS 1: NMAPS 0 No. Clean map files<br>AIPS 1: CMODEL ' ' Model type: 'COMP','IMAG'<br>AIPS 1: 'SUBI' (see HELP re images)<br>AIPS 1: SMODEL *all 0 Source model, 1=flux,2=x,3=y<br>AIPS 1: See HELP SMODEL for details.<br>AIPS 1:<br>AIPS 1: Control options<br>AIPS 1: REFANT 4 Reference antenna<br>AIPS 1: BPASS5 0 If not 0, set BPASSPRM(5) =<br>AIPS 1: BPASS5 ELSE SET IT 1.<br>AIPS 1: See help for details.<br>AIPS 1:<br>AIPS 1: VLBABPSS is defined in the VLBAUTIL run file.<br></pre><div>The output in the console when running this is:</div><pre>LOCALH> BPASS1: Task BPASS (release of 31DEC21) begins<br>LOCALH> BPASS1: Bandpass power (amp & phase) will be normalized<br>LOCALH> BPASS1: Weights in solution will be channel-dependent<br>LOCALH> BPASS1: Array name in AN table is VLBA<br>LOCALH> BPASS1: Will assume this is data from the VLBA correlator<br>LOCALH> BPASS1: and that it is all fringe-rotated to Earth Centre<br>LOCALH> BPASS1: Will remove effects of that fringe-rotation<br>LOCALH> BPASS1: to provide consistent bandpass calibration<br>LOCALH> BPASS1: If incorrect, abort and change array name keyword<br>LOCALH> BPASS1: UVGET: Using flag table version 1 to edit data<br>LOCALH> BPASS1: Calibrating gains<br>LOCALH> BPASS1: Not calibrating bandpass polarization<br>LOCALH> BPASS1: Selecting, editing and calibrating the data with CL vers 5<br>LOCALH> BPASS1: BPCOPY: copied 2912 vis records for bandpass fitting<br>LOCALH> BPASS1: Dividing data by source flux densities<br>LOCALH> BPASS1: 3C286 default spectral index -0.451 -0.180 0.036 0.000 0.000<br>LOCALH> BPASS1: Determining solutions<br>LOCALH> BPASS1: Writing BP table 1<br>LOCALH> BPASS1: Time= 0/ 03 35 21 IFs= 1 - 3 Chann= 1 - 256 Polzn=ALL<br>LOCALH> BPASS1: BASOLV: 1 flagged channels in IF 1<br>LOCALH> BPASS1: BASOLV: will attempt to interpolate across band<br>LOCALH> BPASS1: QINIT: did a GET of 5120 Kwords, OFF 17482016131715<br>LOCALH> BPASS1: BPSOL: wrote 9 records to the BP table<br>LOCALH> BPASS1: Appears to have ended successfully<br></pre><div>I don't see anything obvious here that would indicate a problem with our data. Also, I don't see anything obvious when looking at the total power for antenna 6 pre-bandpass calibration(similarly attaching a photo), and there are no run notes related to antenna 6 (copying them below). I also tried running the bandpass calibration using antenna 6 as the reference antenna, but then all of my data for all antennas was flagged! </div><div>As a last note, the fringe source for this observation was J1331+3030.</div><pre>Project: BK235G2<br>Observer: Kaczmarek, Jane<br>Project type: VLBA<br>Obs filename: bk235g2.vex<br>Date/Day: 2021JUL13/194<br>Ants Scheduled: SC HN NL FD LA PT KP OV BR MK<br>=UT-Time===Comment===============================================MF#===%AD==AMD=<br> Operator: Carolyn Morris <br> 0117 Begin <br>0117-0337 *MK out. AZ#2 motor dead AELEC 100 140<br> 0337 End. <br>Downtime Summary:<br> Total downtime : 140 min<br> Percentage downtime of observing: 10.0%<br> Average downtime per hour : 6.0 min<br> Total scheduled observing time (# Antennas): 1400 min (10)<br></pre><div>Do you happen to have any insight here? </div><div><br></div><div>Thanks a lot for any help you can provide! </div><div><br></div><div>Best,</div><div>Alice Curtin</div>
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<a href="https://help.nrao.edu/file.php/1910YJKSDQYGHP19092976D0277T/UV_coverage_Bk235g2_pstbandpass.png" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">
UV_coverage_Bk235g2_pstbandpass.png
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<a href="https://help.nrao.edu/file.php/1910QWNHPJPCTC19093004AFFDBT/Antenna6_TotalPower_PreBandpass.png" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">
Antenna6_TotalPower_PreBandpass.png
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<a href="https://help.nrao.edu/file.php/1910AYBRADZNKQ1909301A7F019T/UV_coverage_Bk235g2_prebandpass.png" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">
UV_coverage_Bk235g2_prebandpass.png
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