{
  "bibcode": "2021GCN.29788....1W",
  "body": "J. Wood (NASA/MSFC) and C.Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 00:53:16.52 UT on 10 April 2021, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 210410A (trigger 639708801 / 210410037).\nwhich was also detected by the Swift/XRT (A. Melandri et al. 2021, GCN 29778),\nthe Fermi/LAT (M. Arimoto et al. 2021, GCN 29781),\nand AGILE (A. Ursi et al. 2021, GCN 29782).\n\nThe Fermi GBM Final Real-time Localization (GCN 29777) is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 51.0 degrees.\n\nThe GBM light curve consists of a single peak\nwith a duration (T90) of about 48 s (50-300 keV).\nThe time-averaged spectrum from T0-0 s to T0+50 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.70 +/- 0.02 and\nthe cutoff energy, parameterized as Epeak, is 1300 +/- 100 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.5 +/- 0.5)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0 s in the 10-1000 keV band\nis 12.6 +/- 0.3 ph/s/cm^2.\n\nA Band function fits the spectrum equally well \nwith Epeak = 1300 +/- 100 keV, alpha = -0.70 +/- 0.03 and beta = 4.0 +/- 1.6.\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": 29788,
  "createdOn": 1618105372000,
  "email": "joshua.r.wood@nasa.gov",
  "subject": "GRB 210410A: Fermi GBM detection",
  "submitter": "Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>",
  "eventId": "GRB 210410A"
}