{
  "submittedHow": "web",
  "subject": "GRB 260607B: Fermi GBM Observation",
  "submitter": "eliza.neights@gmail.com",
  "createdOn": 1780886946301,
  "eventId": "GRB 260607B",
  "format": "text/plain",
  "circularId": 44861,
  "body": "E. Neights (GWU, NASA GSFC) and E. Palafox (INAOE-Mexico) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 13:19:28.70 UT on 07 June 2026, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 260607B (trigger 802531173/260607555),\nwhich was also detected by Fermi LAT (Holzmann Airasca et al. 2026, GCN 44860).\nThe Fermi GBM on-ground location is consistent with the Fermi LAT position.\n\nThe angle from the Fermi LAT boresight is 72 degrees.\n\nThe GBM light curve consists of multiple emission episodes, with a duration (T90)\nof about 47 s (50-300 keV). The time-averaged spectrum\nfrom T0+2.9 to T0+57.1 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.92 +/- 0.004 and the cutoff energy,\nparameterized as Epeak, is 728 +/- 2 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.999 +/- 0.006)E-04 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+53 s in the 10-1000 keV band is 66.9 +/- 0.5 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/\""
}