{
  "body": "E. Bissaldi (Politecnico and INFN Bari), F. Longo (University and INFN Trieste)\nand Makoto Arimoto (Kanazawa University) report on behalf of the Fermi-LAT Collaboration:\n\n\nAt 01:48:09.44 on January, 18, 2024 Fermi-LAT detected high-energy emission\nfrom GRB 240118A, which was also detected by Fermi-GBM (trigger 727235294 / 240118075, \nGCN #35558).\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 18.57, 29.79 (J2000)\n\nwith an error radius of 0.05 deg (90 % containment, statistical error only).\nThis was 69 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.\nThe photon flux above 100 MeV in the time interval 0-2000 s\nafter the GBM trigger time is (7.3 +/- 1.0)E-6 ph/cm2/s.\nThe estimated photon index above 100 MeV is -1.9 +/- 0.1.\nThe highest-energy photon is a 41 GeV event, which is observed \n732 seconds after the GBM trigger.\n\nA Swift ToO has been requested for this burst.\n\nThe Fermi-LAT point of contact for this burst is \nElisabetta Bissaldi (elisabetta.bissaldi@ba.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.",
  "eventId": "GRB 240118A",
  "submittedHow": "web",
  "submitter": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
  "subject": "GRB 240118A: Fermi-LAT detection",
  "circularId": 35560,
  "createdOn": 1705571881195,
  "bibcode": "2024GCN.35560....1B"
}