{
  "bibcode": "2016GCN.19836....1A",
  "body": "M. Arimoto (Waseda U./Tokyo Tech), M. Axelsson (KTH Stockholm), F.\nDirirsa (U. Johannesburg) and F. Longo (INFN/Trieste)\nreport on behalf of the Fermi-LAT team:\nWe report the on-ground localization and analysis of GRB 160821A,\nwhich triggered\nan onboard LAT detection (McEnery et al., GCN 19831).  All times are\nrelative to the initial GBM\ntrigger (Stanbro et al., GCN 19835).\nThe best LAT on-ground location is found to be:\nRA, Dec = 171.3, 42.3 deg (J2000)\nwith an error radius of 0.08 deg (90 % containment, statistical error\nonly). This is fully\ncompatible with the position of the prompt emission detected by\nSwift/BAT (Siegel et al., GCN 19830).\nThis was 17 deg from the LAT boresight at the time of the GBM trigger\nand triggered\nan autonomous repoint of the spacecraft.\n\nMore than 50 photons above 100 MeV and 4 photons above 1 GeV were\ndetected within 245s,\nbefore the spacecraft entered the SAA. The GRB did not come back into\nthe Fermi-LAT FoV until T0 + 1380s.\n\n The LAT emission was coincident with the bright pulse observed by GBM\nat ~T0+135 s.\nThe highest-energy photon is a 4.7 GeV event which is observed ~212\nseconds after the GBM trigger.\n\n\nThe Fermi-LAT point of contact for this burst is Francesco Longo\n(francesco.longo@trieste.infn.it).\n\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the\nenergy band from\n20 MeV to greater than 300 GeV. It is the product of an international\ncollaboration\nbetween NASA and DOE in the U.S. and many scientific institutions across France,\nItaly, Japan and Sweden.",
  "circularId": 19836,
  "createdOn": 1471845684000,
  "email": "arimoto@hp.phys.titech.ac.jp",
  "subject": "GRB 160821A: Fermi-LAT refined analysis",
  "submitter": "Makoto Arimoto at Tokyo Inst of Tech  <arimoto@hp.phys.titech.ac.jp>",
  "eventId": "GRB 160821A"
}