{
  "bibcode": "2024GCN.37945....1M",
  "createdOn": 1730226011586,
  "submittedHow": "web",
  "submitter": "Ava Myers at NASA GSFC <ava.myers@nasa.gov>",
  "eventId": "GRB 241029A",
  "format": "text/markdown",
  "body": "A. Myers (NPP/GSFC), M. Godwin (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\nAt 02:19:59.87 UT on 29 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 241029A (trigger 751861204/241029097).\nwhich was also detected by SVOM/ECLAIRs (S. Schanne et al., GCN [37934](https://gcn.nasa.gov/circulars/37934)).\nThe Fermi GBM on-ground location is consistent with the SVOM position.\n\nThe angle from the Fermi LAT boresight is 76 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 13.3 s (50-300 keV). The time-averaged spectrum\nfrom T0 to T0+13.152 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.01 +/- 0.04 and the cutoff energy,\nparameterized as Epeak, is 220 +/- 10 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(9.2 +/- 0.3)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 9.6 +/- 0.4 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 190 +/- 20 keV, alpha = -0.96 +/- 0.05 and beta = -2.5 +/- 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/",
  "circularId": 37945,
  "subject": "GRB 241029A: Fermi GBM Observation"
}