GCN Circular 42312
Subject
GRB 251013C: VLA detection
Event
Date
2025-10-16T20:08:06Z (3 days ago)
From
collinchristy@arizona.edu
Via
Web form
C. Christy (University of Arizona), T. Laskar (University of Utah), N. Franz (University of Arizona), K. D. Alexander (University of Arizona), E. Berger (Harvard University), R. Chornock (UC Berkeley), H. J. van Eerten (University of Bath), G. Farley (U. Utah), W. Fong (Northwestern University), R. Gill (UNAM), J. Granot (Open University), R. Margutti (UC Berkeley), and P. Schady (University of Bath) report:
We observed GRB 251013C (Fermi GBM team, GCN 42221; Rakotondrainibe et al., GCN 42222) with the Karl G. Jansky Very Large Array (VLA) at multiple frequencies beginning on 2025 October 15 at 02:15 UT (1.36 days after the burst).
In our preliminary analysis, we detect the radio counterpart (Laskar et al., GCN 42243; Rhodes et al., GCN 42294) at 10 GHz with a flux density of 0.111 +/- 0.012 mJy at the position:
RA (J2000) = 23:03:20.56 +/- 0.03”
Dec (J2000) = -0:12:37.22 +/- 0.03”
This is consistent with the X-ray position (Rakotondrainibe et al., GCN 42222; Evans et al., GCN 42232), optical position (Palmerio et al., GCN 42223; Masi et al., GCN 42228), and radio position (Laskar et al., GCN 42243; Rhodes et al., GCN 42294). Further observations are planned.
We thank the VLA staff for scheduling and executing these observations.