{
  "eventId": "GRB 260410A",
  "createdOn": 1775829801904,
  "subject": "GRB 260410A: Fermi-LAT detection",
  "format": "text/plain",
  "circularId": 44253,
  "submittedHow": "web",
  "body": "A. Holzmann Airasca (Univ. Trento and INFN Bari), D. Depalo (Politecnico and INFN Bari), S. Lopez (CNRS / IN2P3), R. Gupta (NASA / GSFC) and F. Longo (Univ. and INFN Trieste) report on behalf of the Fermi-LAT team the detection of a likely SHORT GRB:\n\nAt 07:03:57.00 UT on April 10th, 2026, Fermi-LAT detected high-energy emission from GRB 260410A, which was also detected by Fermi-GBM (trigger 797497442 / 260410294, GCN #44252).\n\nThe best LAT on-ground location is found to be\nRA, Dec = 110.67, -20.94 (J2000)\nwith an error radius of 0.17 deg (90 % containment, statistical error only).\n\nThis was 49 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 that is spatially and temporally correlated with the trigger with high significance.\n\nThe photon flux above 100 MeV in the time interval 0 - 2 s after the GBM trigger is (1.23 ± 0.38)E-3 ph/cm2/s. The estimated photon index above 100 MeV is -1.84 ± 0.24. The highest-energy photon is a 6.1 GeV event, which is observed 0.37 seconds after the GBM trigger.\n\nThe Fermi-LAT point of contact for this burst is Sara Cutini (sara.cutini@pg.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.",
  "submitter": "A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca@unitn.it>"
}