{
  "subject": "GRB 230913A: Fermi GBM Observation",
  "eventId": "GRB 230913A",
  "circularId": 34689,
  "submittedHow": "web",
  "body": "S. Dalessi (UAH), R. Hamburg (CNRS/IJCLab), and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 07:56:12.16 UT on 13 September 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230913A (trigger 716284577/230913331).\nwhich was also detected by Swift/BAT GUANO (S. Ronchini et al. 2023, GCN 34683).\nThe Fermi GBM Final Real-time Localization was reported in GCN 34680.\n\nThe angle from the Fermi LAT boresight is 41 degrees.\n\nThe GBM light curve single peak with a duration (T90)\nof about 12 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.0 to T0+9.2 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.1 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 160 +/- 10 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.1 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.3 s in the 10-1000 keV band is 2.1 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 130 +/- 20 keV, alpha = 0.3 +/- 0.4 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/\"",
  "bibcode": "2023GCN.34689....1D",
  "createdOn": 1694640368963,
  "submitter": "Sarah Dalessi at UAH <sd0104@uah.edu>"
}