{
  "eventId": "GRB 260608A",
  "circularId": 44886,
  "submitter": "Padraig McDermott at University College Dublin <padraig.mcdermott@ucdconnect.ie>",
  "submittedHow": "web",
  "subject": "GRB 260608A: Fermi GRB Observation",
  "format": "text/plain",
  "createdOn": 1781022868752,
  "body": "Padraig Mc Dermott (UCD) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 11:35:31.06 UT on 08 June 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 260608A (trigger 802611336/260608483).\nwhich was also detected by SVOM ECLAIRs (M.Brunet et al. 2026, GCN 44870, GCN 44882).\nThe Fermi GBM on-ground location is consistent with the SVOM ECLAIRs position.\n\nThe angle from the Fermi LAT boresight is 31 degrees.\n\nThe GBM light curve consists of a main emission followed by a smaller peak with a duration (T90)\nof about 50 s (50-300 keV). The time-averaged spectrum\nfrom T0-6.7 to T0+43.6 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.35 +/- 0.02 and the cutoff energy,\nparameterized as Epeak, is 93 +/- 3 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.83 +/- 0.11)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.83 s in the 10-1000 keV band is 2.1 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\""
}