{
  "subject": "GRB 240825A: Fermi-LAT detection",
  "submittedHow": "email",
  "submitter": "Rahul Gupta at NASA GSFC <rahulbhu.c157@gmail.com>",
  "body": "N. Di Lalla (Stanford University), R. Gupta (NASA GSFC), and A. Holzmann\n(DF, University of Buenos Aires, Argentina) report on behalf of the\nFermi-LAT Collaboration:\n\nOn Aug 25, 2024, Fermi-LAT detected high-energy emission from GRB 240825A,\nwhich was also detected by Fermi-GBM (trigger 746293985 / 240825662, GCN\n37273) and Swift-BAT (Gupta et al., GCN 37274).\n\nThe best LAT on-ground location is found to be:\n\nRA, Dec = 344.56, 1.04 (J2000)\n\nwith an error radius of 0.07 deg (90 % containment, statistical error only).\n\nThis was 52 deg from the LAT boresight at the time of the GBM trigger: T0 =\n15:53:00 UT.\n\nThe data from the Fermi-LAT show a significant increase in the event rate\nthat is spatially and temporally correlated with the GBM emission with high\nsignificance. The photon flux above 100 MeV in the time interval 0-2000 s\nafter the GBM trigger is (2.9 +/- 0.2) E-5 ph/cm2/s. The estimated photon\nindex above 100 MeV is -2.65 +/- 0.09.\n\nThe highest-energy photon is a 40 GeV event which is observed ~ 240 seconds\nafter the GBM trigger.\n\nThe Fermi-LAT point of contact for this burst is Francesco Longo (\nfrancesco.longo@ts.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy\nband from 20 MeV to greater than 300 GeV. It is the product of an\ninternational collaboration between NASA and DOE in the U.S. and many\nscientific institutions across France, Italy, Japan and Sweden.\n",
  "circularId": 37288,
  "bibcode": "2024GCN.37288....1D",
  "createdOn": 1724626720823,
  "eventId": "GRB 240825A"
}