{
  "subject": "GRB 250717B: Fermi GBM Observation",
  "createdOn": 1752778770625,
  "body": "Jacob Smith (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 13:44:22.95 UT on 17 July 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250717B (trigger 774452667/250717572).\nwhich was also detected by Swift/BAT-GUANO (Samuele Ronchini et al. 2025, GCN 41110).\nThe Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position.\n\nThe angle from the Fermi LAT boresight is 74 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 6.4 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.002 to T0+7.360 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.9 +/- 0.1 and the cutoff energy,\nparameterized as Epeak, is 75 +/- 5 keV.\nA Band function fits equally well with Epeak = 72 +/- 6 keV, alpha = -0.9 +/- 0.2 and beta = -3.2 +/- 0.9.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.36 +/- 0.05)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.13 s in the 10-1000 keV band is 6.1 +/- 0.3 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/\"",
  "bibcode": "2025GCN.41111....1S",
  "eventId": "GRB 250717B",
  "submittedHow": "web",
  "circularId": 41111,
  "format": "text/plain",
  "submitter": "Jacob Smith at Fermi-GBM Team <jrs0118@uah.edu>"
}