{
  "bibcode": "2021GCN.30270....1A",
  "body": "M. Axelsson (KTH & Stockholm Univ.), R. Pillera (Politecnico and INFN \nBari) and\nF. Longo (University and INFN Trieste.) report on behalf of the \nFermi-LAT Collaboration:\n\nFermi-LAT has detected high-energy emission from GRB 210619B, which was \nalso detected\nby Swift (GCN 30261), Global MASTER-net (GCN 30262), Ondrejov D50 (GCN \n26263),\nGECAM (GCN 26264), iTelescope T18 (GCN 30265) and SARA-KP (GCN 30268).\n\nThe best LAT on-ground location is found to be\n\n(RA, Dec) = 319.7, 33.9 (degrees, J2000)\n\nwith an error radius of 0.13 deg (90% containment, statistical error \nonly). This position\nis consistent with the XRT localization (GCN 30267). The location of the \nGRB was outside\nthe LAT FoV at the time of the trigger (T0 = 23:59:25 UT on 2021-06-19) \nand came into\nview at T0+200 s.\n\nThe data from the Fermi-LAT show a significant increase  in the event \nrate that is spatially\ncorrelated with the Swift emission with high significance. The highest \nenergy photon is a\n8.3 GeV event detected ~410 s after the trigger.\n\nThe photon flux above 100 MeV in the time interval 200-1000 s after the \nSwift trigger is\n(1.6 +/- 1.2) e-06 ph/cm2/s.\n\nThe estimated photon index above 100 MeV is -1.5 +/- 0.3.\n\nThe Fermi-LAT point of contact for this burst is\nRoberta Pillera (roberta.pillera@ba.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed\nto cover 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 institutions\nacross France, Italy, Japan and Sweden.",
  "circularId": 30270,
  "createdOn": 1624184615000,
  "email": "roberta.pillera@ba.infn.it",
  "subject": "GRB 210619B: Fermi-LAT detection",
  "submitter": "Roberta Pillera at Politecnico and INFN Bari  <roberta.pillera@ba.infn.it>",
  "eventId": "GRB 210619B"
}