TITLE: GCN CIRCULAR NUMBER: 39954 SUBJECT: GRB 250314A: VLA detection DATE: 25/03/31 02:49:59 GMT FROM: Tanmoy Laskar at U of Utah tanmoylaskar@gmail.com
Nayana A. J. (UC Berkeley), T. Laskar (University of Utah), R. Margutti (UC Berkeley), K. D. Alexander (University of Arizona), R. Chornock (UC Berkeley), E. Berger (Harvard University), W. Fong (Northwestern University), P. Schady (University of Bath), and G. Schroeder (Cornell University) report:
"We carried out Karl G. Jansky Very Large Array (VLA) observations of the high-redshift (z ~ 7.3; Malesani et al., GCN 39732; Rakotondrainibe et al., GCN 39743) SVOM/ECLAIRs GRB 250314A (Wang et al., GCN 39719) beginning on 2025 March 21 06:26 UTC (6.7 days after the burst) at multiple frequencies. In preliminary analysis, we detect a radio counterpart with a flux density of ~ 0.1 mJy at 17 GHz, and position:
RA (J2000) = 13:25:12.16 Dec (J2000) = -05:16:55.07
with a (statistical) uncertainty of 0.6" in each coordinate. This position is consistent with the optical position (Malesani et al., GCN 39727). Further observations are planned.
We thank the VLA staff for scheduling and executing these observations"
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