{
  "bibcode": "2012GCN.14010....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 soft GRB 121128A\n(Swift-BAT trigger #539866: Oates et al., GCN 14007)\ntriggered Konus-Wind at T0=18353.307s UT (05:05:53.307)\n\nThe burst light curve shows a multi-peaked structure with\na total duration of ~30 s.\nThe emission is seen up to 6 MeV.\n\nAs observed by Konus-Wind, the burst\nhad a fluence of (7.0 � 0.6)x10-6 erg/cm2,\nand a 64-ms peak flux, measured from T0+5.568 s,\nof (2.05 � 0.15)x10-6 erg/cm2/s\n(both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst (measured T0 to T0+16.640 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 = -0.94 � 0.14,\nthe high energy photon index beta = -3.36 � 0.48,\nthe peak energy Ep = 76 � 4 keV,\nchi2 = 82.6/87 dof.\n\nThe spectrum at the maximum count rate (measured T0 to T0+8.848 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 = +0.87 � 0.13,\nthe high energy photon index beta = -3.32 � 0.46,\nthe peak energy Ep = 87 � 4 keV,\nchi2 = 69.4/60 dof.\n\nAssuming the Gemini North redshift of z=2.20 (Tanvir et al., GCN 14009)\nand a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27,\nOmega_Lambda = 0.73:\nthe isotropic energy release E_iso is (8.2 � 0.7)x10^52 erg,\nthe isotropic peak luminosity L_iso_max is (7.7 � 0.6)x10^52 erg/s,\nand Ep_rest is (243 � 13) keV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB121128_T18353/\n\nAll the quoted results are preliminary.",
  "circularId": 14010,
  "createdOn": 1354104727000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 121128A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 121128A"
}