{
  "bibcode": "2026GCN.43844....1D",
  "createdOn": 1772112885779,
  "eventId": "GRB 260226A",
  "submitter": "Davide Depalo at Politecnico and INFN Bari <davide.depalo@ba.infn.it>",
  "submittedHow": "web",
  "body": "D. Depalo (Politecnico and INFN Bari), E. Bissaldi (Politecnico and INFN Bari), S. Zhu (DESY), R. Gupta (NASA/GSFC), J. L. Racusin (NASA/GSFC), F. Longo (Univ and INFN Trieste) report on behalf of the Fermi-LAT Collaboration:\n\nAt 10:38:18.84 UT on Feb 26, 2026, Fermi-LAT triggered on high-energy emission from GRB 260226A, also detected by GBM (trigger 793795080.95811 / 260226443, GCN Circular 43840) at 10:37:55 UT.  Note that this is a rare onboard detection seeded by LAT, independent of the GBM trigger, which is why the trigger times differ.  LAT-seeded alerts have a very high threshold and this is only the second GRB to have passed this alert after GRB 090510.\n\nThe onboard location is\n\nRA, Dec  42.050, +8.033\n\nwith an approximate error radius of 0.5 deg (90% containment, systematic error only). This was 17 deg from the LAT boresight at the time of the trigger. We anticipate providing a refined location within the next 12 hours when the LAT science data for this burst are downlinked and processed.\n\nThe Fermi-LAT point of contact for this burst is Niccolò Di Lalla (niccolo.dilalla@stanford.edu).\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.",
  "circularId": 43844,
  "format": "text/plain",
  "subject": "GRB 260226A: Fermi-LAT detection of a bright burst"
}