{
  "subject": "GRB 250702F: radio detection with the VLA",
  "bibcode": "2025GCN.41023....1G",
  "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 02:54:00 UT on 2025 July 6 (T_mid = 3.27 days post-burst)\nthe Karl G. Jansky VLA observed the field of GRB 250702F\n(Fermi GBM team, GCN 40892; Klingler et al., GCN 40894;\nFrederiks et al., GCN 40948) in three bands, with central\nfrequencies of 6, 10 and 15 GHz.\n\nThe standard 3C286 was used as bandpass and flux density\ncalibrator, while J1415+1320 was used as phase calibrator.\n\nFrom a preliminary analysis, an unresolved radio source\nis detected at a position (J2000):\n\nRA: 14:11:44.641 +- 0.004\nDec: +16:44:54.68 +- 0.06\n\nconsistent with the X-ray (Goad et al., GCN 40902;\nLiang et al., GCN 40967) and optical (Klingler et al.,\nGCN 40894; Jelinek et al., GCN 40895; Kumar et al., GCN 40896;\nLipunov et al., GCN 40899; Martin-Carrillo et al., GCN 40900;\nde Ugarte Postigo et al., GCN 40901; Angulo et al., GCN 40907;\nBecerra et al., GCN 40911; Brivio et al., GCN 40913; An et al.,\nGCN 40916; Dutton et al., GCN 40921; Odeh et al., GCN 40925;\nMoretti et al., GCN 40926; Siegel et al., GCN 40933; Ma et al.,\nGCN 40936; Vinko et al., GCN 40939; Mohan et al., GCN 40946;\nCiabattari et al., GCN 40968; Broens et al., GCN 40969;\nCalapai et al., GCN 40973; Antier et al., GCN 41011) position\nof 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================================================================\n3.27\t6\t158\t7\t3.31x3.03\t22\n3.27\t10\t127\t6\t2.09x1.95\t31\n3.27\t15\t141\t7\t1.39x1.26\t1\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 SF171028,\napproved in the framework of the Fermi - NRAO joint program agreement.\n",
  "eventId": "GRB 250702F",
  "submitter": "Stefano Giarratana at INAF-OAB <s.giarratana@ira.inaf.it>",
  "submittedHow": "email",
  "createdOn": 1751976637221,
  "circularId": 41023
}