{
  "bibcode": "2011GCN.12223....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,\nP. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the\nKonus-Wind team, report:\n\nThe long GRB 110731A (Swift-BAT trigger #458448: Oates, et al., GCN \n12215; Krimm et al., GCN 12217; also detected by Fermi-LAT: McEnery, GCN \n12218, and Fermi-GBM: Gruber, GCN 12221) triggered Konus-Wind at \nT0=40174.604 s UT (11:09:34.604).\n\nThe burst light curve shows a multipeaked structure with a duration of \n~7 s. There is a low-level emission seen in the G2 band (~80-360 keV) up \nto ~T0+40 s.\n\nAs observed by Konus-Wind the burst\nhad a fluence of 1.63(-0.10,+0.11)x10^-5 erg/cm2,\nand a 64-ms peak flux measured from T0+4.304 s\nof (6.0 +/- 1.3)x10^-6 erg/cm2/s\n(both in the 20 keV - 6 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(from T0 to T0+8.448 s) can be fitted (in the 20 keV - 6 MeV\nrange) by a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with\nalpha = -0.74(-0.15, +0.16),  and\nEp = 288(-25, +30) keV (chi2 = 98.2/76 dof).\nFitting by GRB (Band) model yields the same alpha and Ep,\nand only an upper limit on the high energy\nphoton index: beta < -2.92 (chi2 = 98.1/75 dof).\n\nAll the quoted errors are at the 90% confidence level.\n\nThe Konus-Wind light curve of this GRB is available\nat http://www.ioffe.ru/LEA/GRBs/GRB110731_T40174/",
  "circularId": 12223,
  "createdOn": 1312203227000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 110731A",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>",
  "eventId": "GRB 110731A"
}