{
  "submittedHow": "web",
  "createdOn": 1742181246202,
  "format": "text/plain",
  "submitter": "sumanbala2210@gmail.com",
  "body": "S. Bala (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 08:59:57.69 UT on 16 March 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250316A (trigger 763808402/250316375).\nwhich was also detected by Swift/BAT-GUANO (Ronchini et al. 2025, GCN 39744).\nThe Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position.\n\nThe angle from the Fermi LAT boresight is 98 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 38.7 s (50-300 keV). The time-averaged spectrum\nfrom T0-3.1 to T0+46.1 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.2 +/- 0.1 and the cutoff energy,\nparameterized as Epeak, is 110 +/- 10 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.7 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+16 s in the 10-1000 keV band is 3.5 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 80 +/- 10 keV, alpha = -1 +/- 0.2 and beta = -2.3 +/- 0.2.\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/\"",
  "subject": "GRB 250316A: Fermi GBM Observation",
  "circularId": 39751,
  "eventId": "GRB 250316A",
  "bibcode": "2025GCN.39751....1B"
}