{
  "eventId": "GRB 230919A",
  "bibcode": "2023GCN.34750....1S",
  "createdOn": 1695242981765,
  "circularId": 34750,
  "submitter": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
  "submittedHow": "web",
  "body": "L. Scotton (UAH), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 16:58:23.86 UT on 19 September 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230919A (trigger 716835508/230919707).\nwhich was also detected by AstroSat (Navaneeth et al. 2023, GCN 34742)\nand Swift/BAT-GUANO (DeLaunay et al. 2023, GCN 34747).\n\nThe Fermi GBM Final Real-time Localization was reported in GCN 34737.\n\nThe angle from the Fermi LAT boresight is 120 degrees.\n\nThe GBM light curve consists of multiple peaks \nwith a duration (T90) of about 2.9s. The time-averaged spectrum\nfrom T0-0.06 to T0+1.34 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.74 +/- 0.06 and the cutoff energy,\nparameterized as Epeak, is 2023 +/- 271 keV. \nA Band function fits the spectrum equally well with\nEpeak = 1617 +/- 352 keV, alpha = -0.68 +/- 0.08 and beta = -2.43 +/- 0.32.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.3 +/- 0.1)E-06 erg/cm^2. The 64-msec peak photon flux measured\nstarting from T0+0.58 s in the 10-1000 keV band is 12 +/- 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/\"",
  "subject": "GRB 230919A: Fermi GBM Observation"
}