{
  "bibcode": "2013GCN.15452....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 131105A\n(Swift-BAT trigger 576738: Cummings et al., GCN 15446)\ntriggered Konus-Wind at T0=7527.233 s UT (02:05:27.233).\n\nThe burst light curve shows multiple peaks in the time\ninterval from ~T0-35 s till ~T0+90 s.\nThe emission is seen up to ~3 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB131105_T07527/\n\nAs observed by Konus-Wind, the burst\nhad a fluence of (2.3 � 0.2)x10-5 erg/cm2,\nand a 64-ms peak flux, measured from T0+1.600 s,\nof (2.0 � 0.2)x10-6 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-averaged spectrum (measured from T0 to T0+90.368 s)\nis best fit in the 20 keV - 15 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.88 � 0.38,\nthe high energy photon index beta = -2.33 � 0.33,\nthe peak energy Ep = 156 � 38 keV,\nchi2 = 97/96 dof.\n\nThe spectrum near the maximum count rate\n(measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 15 MeV range\nby the GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -1.04 � 0.27,\nthe high energy photon index beta = -2.64 � 0.76,\nthe peak energy Ep = 174 � 41 keV,\nchi2 = 87.9/97 dof.\n\nAssuming the redshift z=1.686 (Xu, et al., GCN 15450)\nand a standard cosmology model with H_0 = 70 km/s/Mpc,\nOmega_M = 0.27, and Omega_Lambda = 0.73,\nwe estimate the following rest-frame parameters:\nthe isotropic energy release E_iso is (1.7 � 0.1)x10^53 erg,\nthe peak luminosity L_iso is (4.0 � 0.4)x10^52 erg/s,\nand the rest-frame peak energy Ep,i = (420 � 100) keV\n\nAll the quoted values are preliminary.",
  "circularId": 15452,
  "createdOn": 1383650336000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 131105A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 131105A"
}