{
  "body": "C. Malacaria (INAF-OAR) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 12:06:49.88 UT on 06 December 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 241206A (trigger 755179614/241206505).\nThe Fermi GBM Final Real-time Localization is reported in GCN 38447.\nSwift-BAT/GUANO also detected the burst (GCN 38453, DeLaunay et al. 2024) \nand its localization is consistent with the Fermi GBM localization.\n\nThe angle from the Fermi LAT boresight is 38 degrees.\n\nThe GBM light curve consists of a double peak with a duration (T90)\nof about 31 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.9 to T0+16.5 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.5 +/- 0.1 and the cutoff energy,\nparameterized as Epeak, is 87 +/- 12 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.4 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+21 s in the 10-1000 keV band is 6.0 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 70 +/- 20 keV, alpha = -1.4 +/- 0.2 and beta = -2.3 +/- 0.3.\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/\"",
  "submitter": "Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com>",
  "createdOn": 1733571913573,
  "submittedHow": "web",
  "eventId": "GRB 241206A",
  "circularId": 38456,
  "bibcode": "2024GCN.38456....1M",
  "format": "text/plain",
  "subject": "GRB 241206A: Fermi GBM observation"
}