{
  "submittedHow": "email",
  "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),\nL. Nava (INAF-OAB)\n\nAt 11:52:30 UT on 2025 December 6 (T_mid = 4.45 days post-burst)\nand at 11:34:42 UT on 2025 December 11 (T_mid = 9.43 days\npost-burst) the Karl G. Jansky VLA observed the field of\nGRB 251202A / EP251202A (Fermi GBM team, GCN 42933, 42957;\nEinstein Probe team, GCN 42937, GCN 42946; AstroSat CZTI\ncollaboration, GCN 42967; Insight-HXMT team, GCN 42970;\nSVOM team, GCN 42997) in three bands, with central frequencies\nof 6, 10 and 15 GHz.\n\nThe standard 3C286 was used as bandpass and flux density\ncalibrator, while J0818+4222 was used as phase calibrator.\n\nFrom a preliminary analysis, the radio source coincident with\nGRB 251202A (Giarratana et al., GCN 43128) is detected at all\nfrequencies:\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================================================================\n4.45\t6\t99\t7\t1.07x1.02\t54\n4.45\t10\t169\t7\t0.72x0.60\t65\n4.45\t15\t296\t9\t0.45x0.42\t34\n9.43\t6\t118\t7\t1.06x0.95\t-76\n9.43\t10\t219\t7\t0.69x0.58\t89\n9.43\t15\t338\t8\t0.44x0.39\t-74\n================================================================\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 SF181027,\napproved in the framework of the Fermi - NRAO joint program agreement.",
  "circularId": 43471,
  "eventId": "GRB 251202A",
  "subject": "GRB 251202A: further radio observations with the VLA",
  "submitter": "Stefano Giarratana at INAF-OAB <s.giarratana@ira.inaf.it>",
  "createdOn": 1768925981218,
  "bibcode": "2026GCN.43471....1G"
}