{
  "bibcode": "2010GCN.10882....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 GRB 100621A (Swift-BAT trigger=425151;\nUkwatta et al., GCN 10870; Ukwatta et al., GCN 10875)\ntriggered Konus-Wind at T0=11013.352s UT (03:03:33.352)\n\nThe burst light curve shows multiple overlapping peaks\nwith a total duration of ~80 s.\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB100621_T11013/\n\nAs observed by Konus-Wind the burst\nhad a fluence of 3.6(+/-0.4)x10-5 erg/cm2,\nand a 256-ms peak flux measured from T0+26.880s\nof 1.70(+/-0.13)x10-6 erg/cm2/s\n(both in the 20 keV - 2 MeV energy range).\n\nThe time-integrated spectrum of the burst\n(from T0 to T0+73.984 s) is best fit\nin the 20 keV - 2 MeV range by the GRB (Band)\nmodel, for which:\nthe low-energy photon index alpha = -1.70 (+/-0.13),\nthe high energy photon index beta = -2.45 ( <-2.3 ),\nthe peak energy Ep = 95(-13, +18)keV (chi2 = 65/57 dof).\n\nThe spectrum at the maximum count rate\n(measured from T0+24.832 to T0+33.024 s) is best fit\nin the 20 keV - 2 MeV range by the GRB (Band)\nmodel, for which:\nthe low-energy photon index alpha = -1.15 (-0.2/+0.3),\nthe high energy photon index beta = -2.8 (-0.7/+0.3),\nthe peak energy Ep = 83(+/-9)keV (chi2 = 64/57 dof).\n\nAssuming z=0.542 (Milvang-Jensen et al., GCN 10876) and\na standard cosmology model with H_0 = 70 km/s/Mpc,\nOmega_M = 0.27, Omega_Lambda = 0.73,\nthe isotropic energy release E_iso = 2.8(+/-0.3)x10^52 erg,\nthe peak luminosity (L_iso)_max = (2.04+/-0.16)x10^51 erg/s.\n\nAll the quoted results are preliminary.\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 10882,
  "createdOn": 1277288575000,
  "email": "fred@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 100621A",
  "submitter": "Dmitry Frederiks at Ioffe Institute  <fred@mail.ioffe.ru>",
  "eventId": "GRB 100621A"
}