{
  "createdOn": 1735496500974,
  "submitter": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
  "submittedHow": "web",
  "bibcode": "2024GCN.38712....1V",
  "subject": "GRB 241229B: Fermi GBM Observation",
  "eventId": "GRB 241229B",
  "format": "text/plain",
  "circularId": 38712,
  "body": "Peter Veres (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"At 01:36:16.06 UT on 29 December 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 241229B (trigger 757128981/241229067).\nwhich was also detected by Swift BAT (H. A. Krimm et al. 2024, GCN 38699).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 39 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 6 s (50-300 keV). The time-averaged spectrum\nfrom T0-5.1 to T0+4.1 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.7 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 76 +/- 5 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.24 +/- 0.06)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.064 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/\"\n"
}