{
  "body": "C. Malacaria (ISSI) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 12:04:06.93 UT on 10 April 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 230510A (trigger 705413051 / 230510503), which\nwas also detected by the Swift/BAT and Swift/XRT (Eyles-Ferris et al. 2023,\nGCN 33752; Evans et al. 2023, GCN 33756). The GBM on-ground location is\nconsistent with the Swift position (GCN 33751).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 14\ndegrees.\n\nThe GBM light curve shows a weaker peak followed about 100 s later\nby a brighter peak, with a duration (T90) of about 177 s (50-300 keV).\nThe time-averaged spectrum from T0-4.1 s to T0+11.3 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.9 +/- 0.1 and\nthe cutoff energy, parameterized as Epeak, is 87 +/- 7 keV.\nA Band function fits the spectrum equally well\nwith Epeak = 87 +/- 9 keV, alpha = -0.9 +/- 0.1 and beta = -3.8 +/- 3.2.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.0 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+158 s in the 10-1000 keV band\nis 12.4 +/- 0.4 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",
  "bibcode": "2023GCN.33766....1M",
  "createdOn": 1683794165299,
  "submitter": "R. Hamburg at CNRS/IJCLab <rachel.k.hamburg@gmail.com>",
  "subject": "GRB 230510A: Fermi GBM detection",
  "eventId": "GRB 230510A",
  "circularId": 33766
}