{
  "circularId": 33828,
  "createdOn": 1684516065241,
  "eventId": "GRB 230518A",
  "bibcode": "2023GCN.33828....1B",
  "body": "S. Bala (USRA), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 22:49:27.61 UT on 18 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230518A (trigger 706142972/230518951).\nwhich was also detected by Swift/BAT-GUANO (S. Ronchini et al. 2023, GCN\n33825).\nThe Fermi GBM Final Real-time Localization was reported in GCN 33822.\n\nThe angle from the Fermi LAT boresight is 23 degrees.\n\nThe GBM light curve consists of one short peak with a duration (T90)\nof about 0.9 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.7 to T0+0.2 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is 0.6 +/- 0.7 and the cutoff energy,\nparameterized as Epeak, is 503 +/- 138 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.5 +/- 0.9)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.0 s in the 10-1000 keV band is 4 +/- 1 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\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n",
  "submitter": "sumanbala2210@gmail.com",
  "subject": "GRB 230518A: Fermi GBM Observation"
}