{
  "bibcode": "2020GCN.28445....1W",
  "body": "J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team:\r\n\r\n\r\n\r\nSwift-BAT detected GRB 200917A at 03:52:28 UT (Sonbas et al. 2020, GCN 28435).\r\n\r\nThere was no Fermi-GBM onboard trigger around the event.\r\n\r\nAn automated, blind search for short gamma-ray bursts below the onboard triggering\r\n\r\nthreshold in Fermi-GBM also identified no counterparts.\r\n\r\n\r\n\r\nThe GBM targeted search [1], the most sensitive, coherent search for GRB-like\r\n\r\nsignals, was run from +/-30 s around BAT trigger time.\r\n\r\nA transient source was identified whose most significant timescale according to\r\n\r\nthe automated search is 4.096 s, with a log likelihood ratio of 21. This timescale\r\n\r\ncorresponds to the first peak in the lightcurve, occurring -11 seconds before the\r\n\r\nBAT trigger time. The full light curve consists of multiple peaks spanning from\r\n\r\napproximately 11 seconds before to 10 seconds after the BAT trigger time.\r\n\r\n\r\n\r\nThe location is consistent with that from Swift-BAT.\r\n\r\nThe spectrum is consistent with a \"normal\" GRB template\r\n\r\n(Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3).\r\n\r\n\r\n\r\n[1] Goldstein et al. 2019 arXiv:1903.12597",
  "circularId": 28445,
  "createdOn": 1600375202000,
  "email": "joshua.r.wood@nasa.gov",
  "subject": "Fermi-GBM Sub-Threshold Detection of GRB 200917A",
  "submitter": "Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>",
  "eventId": "GRB 200917A"
}