TITLE: GCN CIRCULAR NUMBER: 39932 SUBJECT: GRB 250327B: VLA detection DATE: 25/03/29 21:32:49 GMT FROM: Tanmoy Laskar at U of Utah tanmoylaskar@gmail.com
C. Christy, N. Franz (University of Arizona), T. Laskar (University of Utah), K. D. Alexander (University of Arizona), E. Berger (Harvard University), R. Chornock (UC Berkeley), W. Fong (Northwestern University), R. Margutti (UC Berkeley), P. Schady (University of Bath), and G. Schroeder (Cornell University), report on behalf of a larger collaboration:
“We observed GRB 250327B (Bouchet et al., GCN 39888) with the Karl G. Jansky Very Large Array (VLA) at multiple frequencies beginning on 2025 March 29 at 03:00 UT (29.8 hours after the burst).
In preliminary analysis, we detect a radio counterpart at 15.1 GHz with a flux density of ~0.2 mJy at the position:
RA (J2000) = 11:47:06.72 +/- 0.08” Dec (J2000) = +29:50:24.89 +/- 0.05”
This is consistent with the X-ray position (Bouchet et al., GCN 39888; Page et al. GCN 39895) and optical position (Moskvitin et al., GCN 39889; Xin et al., GCN 39890). Further observations are planned.
We thank the VLA staff for scheduling and executing these observations.”
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