{
  "bibcode": "2009GCN.10189....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 GRB 091120 reported by Fermi GBM, (Gruber, GCN 10187)\nand localized by MAXI GSC (Nakajima et al., GCN 10188)\ntriggered Konus-Wind at T0=16476.183 s UT (04:34:36.183).\n\nThe burst light curve consists of several peaks with a total\nduration of ~55 s. The Konus-Wind light curve of this GRB\nis available at http://www.ioffe.ru/LEA/GRBs/GRB091120_T16476/\nConsiderable hard to soft spectral evolution is noticed during the\ninitial part of the burst.\n\nAs observed by Konus-Wind the burst\nhad a fluence of 2.6(+/-0.3)x10-5 erg/cm2,\nand a 256-ms peak flux measured from T0 + 25.344s\nof 2.4(+/-0.3)x10-6 erg/cm2/s\n(both in the 20 keV - 2 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(from T0 to T0+57.600 s) is well fitted\nin the 20 keV - 2 MeV range by a power law\nwith exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with\nalpha = -1.2(-0.25, +0.28),\nand Ep = 145(-18, +26) keV (chi2 = 67/61 dof).\n\nThe spectrum of the most intense peak (measured\nfrom T0+24.832 to T0+33.024 s) is also well fitted\nin the 20 keV - 2 MeV range by a power law\nwith exponential cutoff model, for which\nalpha = -1.0(-0.4, +0.45),\nand Ep = 101(-15, +16) keV (chi2 = 48/61 dof).\n\n\nAll the quoted results are preliminary.\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 10189,
  "createdOn": 1259069336000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 091120",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 091120"
}