{
  "bibcode": "2013GCN.15619....1G",
  "body": "S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin,\nP. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf\nof the Konus-Wind team, report:\n\nThe long-duration GRB 131226A (Swift-BAT trigger 582123: Oates, et al., \nGCN 15612; Stamatikos, et al. GCN 15613) triggered Konus-Wind at \nT0=20858.013 s UT (05:47:38.013).\n\nThe burst light curve shows a multi-peaked structure with a total \nduration of ~7 s.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of 1.01(-0.07,+0.08)x10^-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+2.704 s,\nof (5.0 +/- 1.0)x10^-5 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum (measured from T0 to T0+8.448 s)\nis well fitted (in the 20 keV - 2 MeV range) by a power law with \nexponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with\nalpha = -0.90(-0.12,+0.13),  and\nEp = 264(-17,+20) keV (chi2 = 65.6/60 dof).\nFitting by a GRB (Band) model yields the same alpha and Ep,\nand only an upper limit on the high energy\nphoton index: beta < -2.5.\n\nAll the quoted values are preliminary.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB131226_T20858/",
  "circularId": 15619,
  "createdOn": 1388155484000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 131226A",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>",
  "eventId": "GRB 131226A"
}