{
  "bibcode": "2015GCN.18245....1R",
  "body": "O.J. Roberts (UCD), G. Younes (GWU), and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 22:38:47.31 UT on the 6th of September 2015, the Fermi\nGamma-Ray Burst Monitor triggered and located GRB 150906A\n(trigger 463271931 / 150906944).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 212.04, DEC = 1.09 (J2000 degrees,\nequivalent to 14h 08m 9.6s, +01d 5' 24\" ), with an uncertainty of\n5.19 degrees (radius, 1-sigma containment, statistical\nonly; there is additionally a systematic error which we\nhave characterized as a core-plus-tail model, with 90%\nof GRBs having a 3.7 deg error and a small tail suffering\na larger than 10 deg systematic error.\n[Connaughton et al. 2015, ApJS, 216, 32]).\n\nThe angle from the Fermi LAT boresight at the GBM trigger\ntime is 29 degrees.\n\nThe trigger resulted in an Autonomous Repoint Request\n(ARR) by the GBM Flight Software owing to the high peak\nflux and hardness of the GRB. This ARR was accepted and\nthe spacecraft slewed to the GBM in-flight location.\n\nThe GBM light curve consists of a single short pulse, with\na duration (T90) of about 1 s (50-300 keV). The\ntime-averaged spectrum from T0-0.064 s to T0+0.064 s is\nadequately fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -0.60 +/- 0.16\nand the cutoff energy, parameterized as Epeak,\nis 597 +/- 130 keV\n\nThe event fluence (10-1000 keV) in this time interval is\n4.944 +/- 0.384)E-07 erg/cm^2. The 64 ms peak photon flux\nmeasured starting from T0-0.064 s in the 8-1000 keV band\nis 13.6 +/- 1.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 18245,
  "createdOn": 1441643419000,
  "email": "oliver.roberts@ucd.ie",
  "subject": "GRB 150906A: Fermi GBM detection",
  "submitter": "Oliver Roberts at UCD/Fermi  <oliver.roberts@ucd.ie>",
  "eventId": "GRB 150906A"
}