GCN Circular 33834
Subject
LIGO/Virgo/KAGRA S230518h: ATCA follow-up of candidate counterparts
Date
2023-05-20T14:56:35Z (2 years ago)
From
Dougal Dobie at VAST <ddobie94@gmail.com>
D. Dobie (Swinburne/OzGrav), A. Gulati (USyd/OzGrav), T. Murphy
(USyd/OzGrav)
and the JAGWAR collaboration.
We have conducted observations of the three candidate optical counterparts
to
S230518h (GCN 33829) and the X-ray source S230518h_X8 (GCN 33824) with the
Australia Telescope Compact Array.
Observations were carried out on 2023-05-20 between 02:40 and 13:30 UTC
with 2x2048 MHz bands centered on 5.5 and 9 GHz. The array is currently in
the compact EW352 configuration and hence we discarded all data from CA06,
resulting in a FWHM angular resolution of approximately 30" and 20" at
5.5 GHz and 9 GHz respectively.
We detect no radio emission at the location of the optical candidates
with the following preliminary 3-sigma upper limits:
| Source | 5.5 GHz (uJy) | 9 GHz (uJy) |
| SSS23a | <90 | <50 |
| SSS23b | <120 | <90 |
| SSS23c | <120 | <60 |
We detect a radio source consistent with the position of S230518h_X8 with
preliminary flux densities of ~350 uJy and ~500 uJy at 5.5 GHz and 9 GHz.
This source was also detected by the Rapid ASKAP Continuum Survey in
observations on 2019-08-03, suggesting it is unrelated to S230518h.
Thank you to CSIRO staff for supporting these observations.