{
  "bibcode": "2024GCN.38130....1G",
  "eventId": "GRB 241025A",
  "circularId": 38130,
  "subject": "GRB 241025A: radio detection with the VLA",
  "createdOn": 1731082912489,
  "submitter": "Stefano Giarratana at INAF-OAB <s.giarratana@ira.inaf.it>",
  "body": "S. Giarratana (INAF-OAB), M. Giroletti (INAF-IRA),\nG. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.), O. S. Salafia (INAF-OAB)\n\nAt 19:11:50 UT on 2024 Oct 25 (T_mid = 0.76 days post-burst)\nthe Karl G. Jansky VLA observed the field of GRB 241025A\n(Ambrosi et al., GCN 37859; Fermi GBM team, GCN 37860;\nSVOM team, GCN 37863; Li et al., GCN 37864; Svinkin et al.,\nGCN 37927) in three bands, with central frequencies of 6,\n10 and 15 GHz.\n\nThe standard 3C286 was used as bandpass and flux density\ncalibrator, while J2344+8226 was used as phase calibrator.\n\nFrom a preliminary analysis, an unresolved radio source\nis clearly detected at a position (J2000):\n\nRA: 22:14:36.859 +- 0.001\nDec: +83:34:32.27 +- 0.02\n\nconsistent with the optical (Ambrosi et al., GCN 37859;\nKlingler et al., GCN 37919) and X-ray (Goad et al., GCN 37868)\nposition of the transient.\n\nThe preliminary analysis yields the following results:\n\n=============================================================\nT_mid\tFreq\tPeak\tr.m.s.\tBeam\t\tPA\n[days]\t[GHz]\t[uJy/b]\t[uJy/b]\t[arcsec^2]\t[deg]\n=============================================================\n0.76\t6\t51\t7\t0.65x0.27\t-71\n0.76\t10\t119\t8\t0.35x0.17\t-78\n0.76\t15\t163\t8\t0.24x0.12\t-65\n=============================================================\n\nNo source is detected with a >3sigma confidence at the\naforementioned position in previous radio surveys (FIRST, NVSS,\nVLASS), all of which have r.m.s. noise levels above\n100 uJy/b.\n\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF171028,\napproved in the framework of the Fermi - NRAO joint program agreement.\n",
  "submittedHow": "email"
}