{
  "bibcode": "2012GCN.13758....1G",
  "body": "S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,\nP. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf\nof the Konus-Wind team, report:\n\nThe long-duration intense hard GRB 120911B\n(IPN detection and localization: Hurley at al., GCN 13755;\nFermi-LAT detection: Racusin et. al., GCN 13756;\nFermi-GBM observation: Gruber et. al., GCN 13757)\ntriggered Konus-Wind at T0=23172.213s UT (06:26:12.213)\n\nThe light curve shows a bright hard pulse with a duration\nof ~30 s followed by a tail of weaker and softer extended\nemission during the next ~150 s; additionally,\na soft weak precursor is observed around T0-55 s.\nThe emission in the main bursting episode is seen up to 9 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB120911_T23172/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 3.0(-0.1,+0.1)x10-4 erg/cm2,\nand a 64-ms peak flux, measured from T0+15.232 s,\nof 3.8(-0.4,+0.4)x10-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the main emission episode\n(measured from T0 to T0+34.048 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.86 (-0.03, +0.03),\nthe high energy photon index beta = -2.6 (-0.2, +0.2),\nthe peak energy Ep = 950(-50, +50) keV,\nchi2 = 78.4/82 dof.\n\nThe spectrum at the maximum count rate\n(measured from T0+14.080 to T0+15.616 s)\nis best fit in the 20 keV - 10 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.63 (-0.08, +0.09),\nthe high energy photon index beta = -2.9 (-1.6, +0.3),\nthe peak energy Ep = 1000(-120, +130) keV,\nchi2 = 81.1/82 dof.\n\n\nAll the quoted results are preliminary.\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 13758,
  "createdOn": 1347519063000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 120911B",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 120911B"
}