{
  "bibcode": "2022GCN.32637....1B",
  "body": "E Bissaldi (Politecnico and INFN Bari), N. Omodei (Stanford Univ.),\nM. Kerr (NRL), report on behalf of the Fermi-LAT team:\n\n\nAt 14:17:05.99 on October, 09, 2022 Fermi-LAT detected high-energy emission\nfrom Swift J1913.1+1946 or GRB 221009A, which was reported by\nSwift (Dichiara et al. GCN #32632) and by GBM (Veres et al. GCN #32636).\nThe best LAT on-ground location is found to be\n\nRA, Dec = 288.21, 19.73 (J2000)\n\nwith an error radius of 0.09 deg (90 % containment, statistical error only).\nThis was 94 deg from the LAT boresight at the time of the trigger.\n\nThe data from the Fermi-LAT show a significant increase in the event rate\nthat is spatially and temporally correlated with the trigger with high significance.\n\nThe 100 MeV - 1 GeV photon flux in the time interval 500-3500 s after\nthe Swift trigger is (1.27 +/- 0.16)E-05 ph/cm2/s.\nThe estimated photon index above 100 MeV is -2.12 +/- 0.11.\nThe highest-energy photon is a 7.8 GeV\nwhich is observed 766 seconds after the Swift trigger.\n\nThe Fermi-LAT point of contact for this burst is\nElisabetta Bissaldi (elisabetta.bissaldi@ba.infn.it).\n\n\nThe Fermi-LAT is a pair conversion telescope designed to\ncover the energy band from 20 MeV to greater than 300 GeV.\nIt is the product of an international collaboration\nbetween NASA and DOE in the U.S. and many scientific\ninstitutions across France, Italy, Japan and Sweden.",
  "circularId": 32637,
  "createdOn": 1665351905000,
  "email": "elisabetta.bissaldi@ba.infn.it",
  "subject": "GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection",
  "submitter": "Elisabetta Bissaldi at INFN,Bari  <elisabetta.bissaldi@ba.infn.it>",
  "eventId": "GRB 221009A"
}