{
  "createdOn": 1738856560473,
  "format": "text/plain",
  "body": "O. Mukherjee (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 21:25:33.72 UT on 05 February 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 250205A (trigger 760483538/250205893).\nwhich was also detected by SVOM (Saccardi et al. 2025, GCN 39154), Swift XRT (Kennea et al. 2025, GCN 39161), \nand OSIRIS+/GTC with z = 3.55 (Postigo et al. 2025, GCN 39160).\nThe Fermi GBM on-ground location is consistent with the SVOM position.\n\nThe angle from the Fermi LAT boresight is 59 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 105 s (50-300 keV). The time-averaged spectrum\nfrom T0-63 to T0+75 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.2 +/- 0.1 and the cutoff energy,\nparameterized as Epeak, is 83 +/- 3 keV. A Band function\nwith Epeak = 80 +/- 5 keV,\nalpha = -0.2 +/- 0.16 and beta = -3.11 +/- 0.39 fits the spectrum equally well.\n \n\nThe event fluence (10-1000 keV) in this time interval is\n(6.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.38 s in the 10-1000 keV band is 2 +/- 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/\"",
  "bibcode": "2025GCN.39171....1M",
  "submittedHow": "web",
  "submitter": "oindabimukherjee@gmail.com",
  "subject": "GRB 250205A: Fermi GBM Observation",
  "circularId": 39171,
  "eventId": "GRB 250205A"
}