TITLE: GCN CIRCULAR NUMBER: 30713 SUBJECT: GRB 210822A: VLA detection DATE: 21/08/25 14:47:06 GMT FROM: Tanmoy Laskar at U of Bath tanmoylaskar@gmail.com
T. Laskar (University of Bath), K. D. Alexander (Northwestern), E. Berger (Harvard), R. Chornock (UC Berkeley), W. Fong (Northwestern), R. Margutti (UC Berkeley), C. G. Mundell (University of Bath), P. Schady (University of Bath), and G. Schroeder (Northwestern) report on behalf of a larger collaboration:
"We observed GRB 210822A (Page et al. GCN 30677) with the Karl G. Jansky Very Large Array (VLA) beginning on 2021 August 24 at 05:30 UT (1.9 d after the burst). At a mean frequency of 14.8 GHz, we detect a radio source with a preliminary flux density of ~ 0.4 mJy at the position:
RA (J2000) = 20:17:44.992 +/- 0.001 Dec (J2000) = 05:16:59.53 +/- 0.02
consistent with the position of the optical afterglow (Page et al., GCN 30677) and the Swift/XRT afterglow (Evans al., GCN 30682). Follow-up observations are planned.
We thank the VLA staff for rapidly executing these observations."