VLA Archive file 22B-193_sb42958191_1_1.59903.74775888889

[eacmills]

SB 42958191 JACKS region 3

• [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)

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[eacmills]

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Log Name: 2022-11-20_1756_22B-193 Project: 22B-193 SBID(s): 42958191 EBID(s):
Observing Date: 20-Nov-2022 Observation Type: Science Bands Used: X K No. Subarrays: 1 Observer(PI): Prof Elisabeth Mills Source File(s): 22B-193_sb42958191_1_1 Operator(s): Katie Grabowski and Deena Mickelson Array Configuration: C Decommissioned Antenna: 20

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) 20Nov 17:58:46 -5.6 3.8 N at 2.0 m/s 792.4 8.6 20Nov 19:01:01 -6.7 6.0 SW at 1.5 m/s 791.5 5.9 20Nov 20:00:35 -9.1 6.9 NE at 2.8 m/s 790.6 12.0 20Nov 20:16:37 -10.1 7.3 E at 2.9 m/s 790.3 8.0 20Nov 21:16:42 -15.3 8.1 N at 1.9 m/s 789.9 13.3

Operator comments for the above weather entries

20Nov 17:58:46 Sky clear.
20Nov 19:01:01 Sky clear.
20Nov 20:00:35 Sky clear.
20Nov 20:16:37 Sky clear.
20Nov 21:16:42 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

20Nov 17:56:46 Starting project 22B-193.

20Nov 17:56:46 The band(s) used is(are): X K.

20Nov 17:58:20 On source 3C286 with all available antennas.

20Nov 17:56:46 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/

20Nov 17:56:46 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/

20Nov 19:10:43 20Nov 19:16:05 SOFTWARE Other 7.29 39.1 Antenna(s) All (Data: Lost): The Correlator Back End is reporting approximately 27% of each subband has a value of zero.

20Nov 17:56:46 NOTE: API has climbed above the max of 10 a couple of times during this obser- vation, so Operators plan to email this log to our Data Analysts and ask them to verify we don't need to reschedule this.

20Nov 21:26:12 NOTE: Actual end time of observation. Project End Time different for log-keeping purposes only.

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

20-Nov-2022 21:27:11 5681.3 0.7% 39.1

[eacmills]

Pipeline issues noted by staff:

• Per the operator, the CBE reported ~27% of each spectral window was 0 value from ~19:10:43 - 19:16:05: the pipeline shows a total fraction of zero value data below 1%.

• ea17 has one san with very high gain amplitude solutions for B0D0 spws.

• ea18 has variable gain amplitude solutions for A0C0 spws.

• ea21 has low gain amplitude solutions for the complex gain calibrator scans.

• ea26 does not appear to be pointing well for the first portion of the observation.

[xinglunju]

Light-cleaned continuum image (left). Right panel is MeerKAT L-band continuum image for comparison. This field is to the north-eastern side of Sgr B2.