{
  "bibcode": "2015GCN.18190....1R",
  "body": "O.J. Roberts (UCD) reports on behalf of the Fermi GBM team:\n\n\"At 09:44:20.33 UT on August 21st 2015, the Fermi Gamma-Ray\nBurst Monitor triggered and located GRB 150821A (trigger\n461843064/150821406), which was also detected by Swift\n(Troja et al. 2015, GCN 18186).\n\nThe trigger resulted in an Autonomous Repoint Request (ARR)\ndue to the high peak flux of the GRB. This ARR was accepted\nand the spacecraft slewed to the GBM in-flight location. Both\nthe GBM in-flight and on-ground locations are consistent with\nthe Swift position.\n\nThe angle of the burst direction to the Fermi LAT boresight\nis 57 degrees.\n\nThe GBM light curve consists of a FRED-like burst, with two\nunresolved peaks and a duration of about 103 s (50-300 keV).\nThe time-averaged spectrum from T0-2.0s to T0+101.4s is well\nfit by a Band function with Epeak = 322 +/- 18 keV,\nAlpha =-1.21 +/- 0.01 and Beta = -2.27 +/- 0.10.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.87 +/- 0.08)E-05 erg/cm^2. The 1.024 s peak photon flux\nmeasured starting from T0+17.1s in the 10-1000 keV band\nis 11.1 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 18190,
  "createdOn": 1440171829000,
  "email": "oliver.roberts@ucd.ie",
  "subject": "GRB 150821A: Fermi GBM detection",
  "submitter": "Oliver Roberts at UCD/Fermi  <oliver.roberts@ucd.ie>",
  "eventId": "GRB 150821A"
}