TITLE: GCN CIRCULAR NUMBER: 37569 SUBJECT: GRB 240910A: radio detection with the VLA DATE: 24/09/20 12:28:03 GMT FROM: Stefano Giarratana at INAF-OAB <s.giarratana@ira.inaf.it> S. Giarratana (INAF-OAB), M. Giroletti (INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.), N. Omodei (Stanford Univ.), O. S. Salafia (INAF-OAB) At 05:42:45 UT on 2024 Sept 13 (T_mid = 3.10 days post-burst) the Karl G. Jansky VLA observed the field of GRB 240910A (Fermi GBM team, GCN 37441, 37464; SVOM team, GCN37445, 37503) at a central frequency of 6, 10 and 15 GHz. The standard 3C48 was used as bandpass and flux density calibrator, while J0125-0005 was used as phase calibrator. From a preliminary analysis, an unresolved radio source is clearly detected at a position: RA: 01:36:23.458 +- 0.003 Dec: -00:12:17.42 +- 0.05 consistent with the optical (GOTO collaboration, GCN 37459; Jiang et al., GCN 37460) and X-ray (D'Ai et al., GCN 37461) transient. The surface brightness peak is 137 uJy/beam, 114 uJy/b and 86 uJy/beam at 6, 10 and 15 GHz, respectively. The r.m.s. noise level of the images is 7 uJy/beam at 6 GHz, 7 uJy/b at 10 GHz and 9 uJy/b at 15 GHz. The synthesized beams are 1.36x1.01 arcsec (PA: -48deg) at 6 GHz, 0.79x0.63 arcsec (PA: -50deg) at 10 GHz and 0.61x0.43 arcsec (PA: -56deg) at 15 GHz. While no source is detected with a 3sigma confidence at the aforementioned position in previous radio surveys (FIRST, NVSS, VLASS, RACS), their r.m.s. noise levels (1sigma) is above 100 uJy/b. Therefore, we cannot exclude the contribution from the GRB host galaxy yet. We would like to thank the staff of the VLA for approving, executing, and processing the observations. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. These observations were carried out as part of project SF171028, approved in the framework of the Fermi - NRAO joint program agreement. View this GCN Circular online at https://gcn.nasa.gov/circulars/37569. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...