{
  "bibcode": "2012GCN.13736....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.\nOleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind\nteam report:\n\nThe long GRB 120909A (Swift-BAT trigger #533060:\nImmler et al., GCN 13727; Ukwatta et al., GCN 13733)\nwas detected by Konus-Wind in the waiting mode\nstarting at 6069 s UT (01:41:09), ~54s before the T0(BAT).\n\nThe burst light curve shows a multi-peaked structure\nwith a total duration of ~115s.\n\nThe K-W light curve of this burst is available at\nhttp://www.ioffe.rssi.ru/LEA/GRBs/GRB120909A/\n\nAs observed by Konus-Wind, the burst had a fluence\nof (2.3 � 0.2)x10-5 erg/cm2 and a peak energy flux,\nmeasured on the 2.944-s scale, of (6.1 � 0.8)x10-7 erg/cm2\n(both in the 20 - 1500 keV energy range).\n\nModelling the K-W 3-channel time-integrated spectrum\n(from T0(BAT)-54s to T0(BAT)+61 s)\nby a power law with exponential cutoff model:\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nyields alpha = -1.23 � 0.04, and Ep = 335 � 25 keV\n\nAssuming X-Shooter redshift of z=3.93 (Hartoog et al., GCN 13730)\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 (6.9 � 0.5)x10^53 erg,\nthe isotropic peak luminosity L_iso_max is (9.0 � 1.2)x10^52 erg/s,\nand Ep_rest is (1650 � 120) keV.\n\nAll the quoted errors are estimated at the 1 sigma confidence level.",
  "circularId": 13736,
  "createdOn": 1347215303000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 120909A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 120909A"
}