{
  "bibcode": "2021GCN.30375....1B",
  "body": "A. Berretta (University & INFN Perugia), F. Longo (University and\nINFN, Trieste),\nM. Axelsson (KTH & Stockholm Univ.), E. Bissaldi (Politecnico and INFN, Bari),\nF. Piron (CNRS/IN2P3/LUPM) and M. Arimoto (Kanazawa Univ.)\nreport on behalf of the Fermi-LAT Collaboration:\n\nOn July 4th, 2021, Fermi-LAT detected high-energy emission from GRB 210704A\nwhich was also detected by Fermi-GBM (trigger 647120009/210704815) and\nby AGILE/MCAL (GCN 30372).\n\nThe best LAT on-ground location is found to be\nRA, Dec = 159.08, 57.31 (degrees, J2000)\nwith an error radius of 0.11 deg (90% containment, statistical error only).\nThis was 63 deg from the LAT boresight at the time of the GBM trigger:\nT0 = 19:33:24.59 UT.\n\nThe data from the Fermi-LAT show a very significant increase\nin the event rate after the GBM trigger that is temporally and spatially\ncorrelated with the GBM emission with high significance.\n\nThe photon flux above 100 MeV in the time interval 0-10s after the GBM trigger\nis (1.60 +/- 0.31) E-03 ph/cm2/s.\nThe estimated photon index above 100 MeV is -1.74 +/- 0.13.\nThe highest-energy photon is a 16 GeV event which is observed 1.5 seconds\nafter the GBM trigger.\n\nThe Fermi-LAT point of contact for this burst is Alessandra Berretta\n(alessandra.berretta@pg.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover\nthe energy band from 20 MeV to greater than 300 GeV.\nIt is the product of an international collaboration between\nNASA and DOE in the U.S. and many scientific institutions\nacross France, Italy, Japan and Sweden.",
  "circularId": 30375,
  "createdOn": 1625483991000,
  "email": "franzlongo1969@gmail.com",
  "subject": "GRB 210704A: Fermi-LAT detection",
  "submitter": "Francesco Longo at U of Trieste,INFN Trieste  <franzlongo1969@gmail.com>",
  "eventId": "GRB 210704A"
}