{
  "bibcode": "2013GCN.14473....1V",
  "body": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 07:47:06.42 UT on 27 April 2013, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 130427A (trigger 388741629/130427324) which\nwas also detected by the Swift/BAT and Fermi/LAT (Maselli et al. 2013, \nGCN 14448  and S. Zhu et al., GCN 14471) The GBM on-ground location is \nconsistent with the Swift position.\n\nThe angle from the Fermi LAT boresight is 48 degrees.\n\nBased on hard and intense emission in a GBM BGO detector, GBM \ninitiated an Autonomous Report Request. This request caused Fermi \nto reorient towards this GRB (GBM flight location).  \n\nThe GBM light curve consists of a bright structured peak followed \nat ~T0+120 s by a FRED-like pulse. The overall duration (T90) \nis about 138s s (50-300 keV).\n\nOwing to the brightness of the burst, systematic effects are very large \nand no single model gives an adequate fit in this preliminary analysis.  \nA Band function fit in the interval  from T0+0.002 s to T0+18.432 s yields \nthe following parameters Epeak = 830 +/- 5 keV, alpha = -0.789 +/- 0.003, \nand beta = -3.06 +/- 0.02. \n\nThe event fluence (10-1000 keV) in this time interval is\n(1.975 +/- 0.003)E-03 erg/cm^2. The 1.024 sec peak photon flux measured\nstarting from T0+7.48808 s in the 8-1000 keV band\nis 1052 +/- 2 ph/s/cm^2, making this the most intense and fluent GRB \ndetected by Fermi GBM.\n\nFurther analysis is being performed\"",
  "circularId": 14473,
  "createdOn": 1367094439000,
  "email": "azk@mpe.mpg.de",
  "subject": "GRB 130427A: Fermi GBM observation",
  "submitter": "Andreas von Kienlin at MPE  <azk@mpe.mpg.de>",
  "eventId": "GRB 130427A"
}