{
  "circularId": 35342,
  "bibcode": "2023GCN.35342....1K",
  "submitter": "Makoto Arimoto at Tokyo Inst of Tech <arimoto@hp.phys.titech.ac.jp>",
  "eventId": "GRB 231214A",
  "body": "D. Kocevski (NASA/MSFC), N. Di Lalla (Stanford University), M. Arimoto\n(Kanazawa University), and T. Khalil (Johannesburg University) report\non behalf of the Fermi-LAT Collaboration:\n\nOn December 14, 2023 Fermi-LAT detected high-energy emission from GRB\n231214A, which was also detected by Fermi-GBM (trigger\n724278269.684604 / 231214850, GCN 35334), Swift-BAT and Swift-XRT (GCN\n35335, 35341).\n\nThe best LAT on-ground location is found to be\nRA, Dec = 306.1, -72.4 (degrees, J2000)\nwith an error radius of 0.2 deg (90% containment, statistical error\nonly). This was 51 deg from the LAT boresight at the time of the GBM\ntrigger: T0 = 20:24:24.69 UT.\n\nThe data from the Fermi-LAT show a significant increase in the event\nrate after the GBM trigger that is spatially correlated with the GBM\nemission with high significance. The photon flux above 100 MeV in the\ntime interval 0-3000 s after the GBM trigger is (3.9 +/- 0.8)E-6\nph/cm2/s.\nThe estimated photon index above 100 MeV is -1.9 +/- 0.2. The\nhighest-energy photon is a 2.9 GeV event which is observed 414 seconds\nafter the GBM trigger.\nThe Fermi-LAT point of contact for this burst is Tamador Khalil\n(tamtam2030@gmail.com)\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the\nenergy band from 20 MeV to greater than 300 GeV. It is the product of\nan international collaboration between NASA and DOE in the U.S. and\nmany scientific institutions across France, Italy, Japan and Sweden.\n\n",
  "submittedHow": "email-legacy",
  "createdOn": 1702621550987,
  "subject": "GRB 231214A: Fermi-LAT detection"
}