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GCN Circular 21628

Subject
LIGO/Virgo G298048: ATCA 8.5 GHz observations of galaxies in the localisation volume
Date
2017-08-21T07:45:30Z (7 years ago)
From
Tara Murphy at U of Sydney <tara.murphy@sydney.edu.au>
C. Lynch (University of Sydney), T. Murphy (University of Sydney),
D. Kaplan (UWM), K. Bannister (CSIRO), D. Dobie (University of Sydney)
on behalf of the VAST collaboration.

We have observed 54 galaxies in the localisation volume of G298048 as
listed by
Cook et al. (LVC GCN 21519) with the Australia Telescope Compact Array at
8.5 GHz (Bannister et al. LVC GCN 21537). The observations were taken in the
EW352 configuration, with approximately 1-2 minutes on each source between
2017-08-18 01:00 UT and 2017-08-18 09:14:15 UT.

We detected 8.5 GHz radio emission from 5 galaxies, as listed below:

Galaxy                  3-sigma flux density
UGCA 331            0.33 mJy
NGC 4993            0.66 mJy
NGC 4968            16.1 mJy
IC 4197                 2.7 mJy
ESO 508- G 033   3.7 mJy

The rest of the sources in the list were non-detections. We list 3-sigma
upper limits on the 8.5 GHz radio emission below:

Galaxy                                                       3-sigma flux
density limit
IC 3825                                                      102.8 uJy
ABELL 1631:[CZ2003]B0295[024]            47.1 uJy
GALEXASC J125157.02-160617.8           43.7 uJy
MCG -02-33-036                                        24.9 uJy
2MASX J12525109-1529300                    33.2 uJy
GALEXASC J125301.39-151007.7           36.9 uJy
WINGS J125412.84-153523.6                   25.9 uJy
6dF J1254495-160308                               36.2 uJy
GALEXASC J125520.46-170546.9            33.6 uJy
HIPASS J1255-15                                       36.5 uJy
ESO 575- G 029                                         46.8 uJy
MCG -03-33-023                                        198.8 uJy
WINGS J125701.38-172325.2                   213.4 uJy
NGC 4830                                                  60.0 uJy
GALEXASC J125811.97-210246.3            22.6 uJy
GALEXASC J130415.26-225251.3            21.2 uJy
ESO 575- G 053                                         50.4 uJy
6dF J1305235-233121                               18.2 uJy
GALEXASC J130525.30-233008.8            12.8 uJy
2MASX J13061939-2258491                      77.5 uJy
ESO 508- G 003                                          60.3 uJy
ESO 575- G 055                                          85.7 uJy
ESO 508- G 004                                          66.2 uJy
UGCA 325                                                   35.0 uJy
GALEXASC J130707.37-240634.4             35.0 uJy
NGC 4970                                                   48.5 uJy
ABELL 1664_11:[PSE2006] 2506               54.7 uJy
ESO 508- G 010                                         39.2 uJy
UGCA 327                                                  39.8 uJy
USGC S204                                                44.5 uJy
HDCE 0763                                                39.2 uJy
ESO 508                                                     62.8 uJy
ESO 508- G 014                                         56.0 uJy
2MFGC 10461                                            44.3 uJy
6dF J1309177-242256                               24.6 uJy
GALEXASC J130918.58-242304.8            25.6 uJy
UGCA 328                                                  23.1 uJy
ESO 576- G 003                                         49.4 uJy
[TSK2008] 0073                                          32.2 uJy
GALEXASC J131426.62-271242.6            53.4 uJy
[TSK2008] 0052                                          56.6 uJy
ESO 508- G 035                                         70.5 uJy

We have not yet been able to make reliable measurements for the following 7
sources, so they are excluded from the above lists:

2MASX J12505229-1454238
2MASX J12573271-1942006
2MASX J13073768-2356181
GALEXASC J125259.36-152150.9
IC 4180
2MFGC 10484
ESO 508- G 019

We did not observe GALEXASC J120652.88-040236.6.

Further observations are underway. Thank you to CSIRO staff for supporting
these observations.
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