VLA Archive file 22B-193_sb43002391_1_1.59924.69441498842

[eacmills]

SB 43002391 JACKS region 7

• [x] Observations completed
• [x] VLA CASA Calibration pipeline run by observatory
• [x] Weblog downloaded and unpacked
• [ ] Raw data downloaded (specify where)
  • [ ] local machine
  • [ ] Globus
• [ ] Pipeline calibration assessment
• [ ] Calibrated MS generated
  • [ ] Uploaded to Globus
• [ ] Imaging: Continuum
• [ ] Imaging: Lines
  • [ ] NH3 (1,1)
  • [ ] NH3 (2,2)
  • [ ] NH3 (3,3)
  • [ ] NH3 (4,4)
  • [ ] NH3 (5,5)
  • [ ] H2O
  • [ ] H64
  • [ ] H66
  • [ ] NH3 (2,1)
  • [ ] NH3 (3,2)
  • [ ] NH3 (4,3)
  • [ ] NH3 (5,4)
  • [ ] NH3 (6,5)

    Product Links

[eacmills]

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Log Name: 2022-12-11_1639_22B-193 Project: 22B-193 SBID(s): 43002391 EBID(s):
Observing Date: 11-Dec-2022 Observation Type: Science Bands Used: X K No. Subarrays: 1 Observer(PI): Prof Elisabeth Mills Source File(s): 22B-193_sb43002391_1_1 Operator(s): Victor Acosta Array Configuration: C Decommissioned Antenna: 12

Adobe PDF version of this log is located at: http://www.vla.nrao.edu/operators/logs/

WEATHER INFORMATION

Time(UTC) Dew Pt Temp Wind Bar Press API RMS Phase(degs) 11Dec 16:41:49 -1.3 2.4 W at 1.6 m/s 788.9 4.7 11Dec 18:00:10 -8.6 9.2 SW at 8.4 m/s 787.3 9.7 11Dec 20:00:12 -9.2 11.7 SW at 5.3 m/s 785.9 12.8

Operator comments for the above weather entries

11Dec 16:41:49 Sky clear.
11Dec 18:00:10 Sky clear.
11Dec 20:00:12 Sky clear.

COMMENTS AND OUTAGES

Outage information format: Start Time, End Time, Category, Form#, # Antennas, Down Time(minutes) Antenna ID(s) and Data Effect Description

Number of Antennas Used: 27

11Dec 16:39:57 Starting project 22B-193.

11Dec 16:39:57 The band(s) used is(are): X K.

11Dec 16:41:35 On source 3C286 with all available antennas.

11Dec 16:39:57 Antenna(s):20 have recently updated baseline parameters to correct for errors resulting from their recent relocation. Please check for any significant errors and submit them to the NRAO Helpdesk (https://science.nrao.edu/observing/helpdesk) under the VLA Observing department.

11Dec 16:39:57 To access your data from the NRAO archive visit: https://science.nrao.edu/facilities/vla/archive All VLA science data are processed through the VLA calibration pipeline. Details are at: https://science.nrao.edu/facilities/vla/data-processing/pipeline For further questions please use the NRAO Helpdesk at: https://science.nrao.edu/observing/helpdesk Adobe PDF version of this log is located at: http://www.vla.nrao.edu/operators/logs/

11Dec 16:39:57 Note: To support our ongoing RFI monitoring efforts, any feedback from your program on RFI can be sent to: nrao-rfi@nrao.edu The key information to provide is:

• Observation/project code
• Frequency and Time of the observations
• The characteristics of the RFI signal, in particular if it is continuous or intermittent?
• If possible, a spectrum of the RFI should be included in the e-mail. Thanks very much for your support; this information will be continuously updated on the EVLA science pages at: https://science.nrao.edu/facilities/vla/docs/manuals/obsguide/modes/rfi/

11Dec 16:39:57 11Dec 20:10:23 LO-IF WO-15242 0.33 69.4 Antenna(s) 8 (Data: Lost): M301:T303_SW S1_2_ERROR_MON alert, affecting K band.

Project End Time Total Time % Down Time Total Down Time (minutes x 27 ants) (minutes)

11-Dec-2022 20:10:23 5681.7 1.2% 69.4

[eacmills]

Issues noted but not flagged by staff during pipeline run:

• ea08 hardware issue, flagged

• ea14 A0C0 scan 43 18:43:57~18:44:39 L polarization amp drops out, very high weights, recommend flagging

[aschmiedeke]

Operator notes

• antenna 20 has recently updated baseline parameters to correct for errors resulting from their recent relocation
• antenna 8 has some lost data (K-band)

Issues noted but not flagged by staff

• ea08 hardware issue, flagged
• ea14 A0C0 scan 18:43:57~18:44:39 L polarization amp drops out, very high weights

By tasks

• no low QA scores

• step 14: ~12% of data flagged, seems normal

• step 13:

  • final amp time cal: ea27. I'm not sure if this is normal behaviour, or if we need to flag something?

  • otherwise everything looks ok

• step 17:

  • nothing out of the ordinary

• step 19:

  • 3C286 and J1744 are point sources with the same shape as the beam
  • pbcor image max
    • 3C286: 2.4 Jy/beam (~ 2.4 Jy in step 4)
    • J1744: 539 mJy/beam (~561 mJy in step 12)
  • beam size of J1744: 1.88 x 0.705 arcsec

[xinglunju]

The plot from step 13 does look strange: I think the data points should all be around unity? Then several other antennas, including ea09, ea18, ea21, do not seem right either. Link to the plots

However, these plots are showing the calibration table, not the calibrated data themselves. So the high scatters may just mean that a large correction is to be applied to the raw data. We can run the calibration pipeline and then make the amp vs. time plot using the calibrated data to confirm this.