{
  "bibcode": "2017GCN.21085....1R",
  "body": "O.J. Roberts (USRA/NASA), E. Bissaldi (Politecnico & INFN Bari)  \nand C. Meegan (UAH) report on behalf of the Fermi GBM Team:\n\n\"At 05:12:25.73 UT on 10 May 2017, the Fermi Gamma-Ray Burst \nMonitor triggered and located GRB 170510A \n(trigger 516085950 / 170510217), which was also detected by the \nFermi/LAT (Bissaldi et al. 2017, GCN 21081).\n\nThe GBM on-ground location is consistent with the LAT position.\n\nThe trigger resulted in an Autonomous Repoint Request (ARR) by \nthe GBM Flight Software owing to the high peak flux of the GRB.\nThis ARR was accepted and the spacecraft slewed to the GBM \nin-flight location. \n\nThe angle from the Fermi LAT boresight is 67 degrees.\n\nThe GBM light curve consists of multiple peaks with a \nduration (T90) of about 128 s (50-300 keV). The time-averaged\nspectrum from T0+2.0 s to T0+130.0 s is best fit by a power law\nfunction with an exponential high-energy cutoff. The power law \nindex is -0.82 +/- 0.03 and the cutoff energy, parameterized as \nEpeak, is 302 +/- 13 keV.\n\nA Band function fits the spectrum equally well with \nEpeak= 264 +/- 17 keV, alpha = -0.77 +/- 0.04 and \nbeta = -2.33 +/- 0.16.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.78 +/- 0.11)E-05 erg/cm^2. The 1-sec peak photon flux \nmeasured starting from T0+21.8 s in the 10-1000 keV band \nis 17.0 +/- 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.\"",
  "circularId": 21085,
  "createdOn": 1494438433000,
  "email": "oliver.roberts@nasa.gov",
  "subject": "GRB 170510A: Fermi GBM observation",
  "submitter": "Oliver J Roberts at USRA/NASA  <oliver.roberts@nasa.gov>",
  "eventId": "GRB 170510A"
}