{
  "bibcode": "2006GCN..5748....1G",
  "body": "S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and\nT. Cline on behalf of the Konus-Wind team report:\n\nThe long GRB 061021 (Swift-BAT trigger #234905:\nMoretti et al., GCN 5743; Palmer et al., GCN 5744)\ntriggered Konus-Wind at T0=56348.304 s UT (15:39:08.304).\n\nAs observed by Konus-Wind the burst shows\na single pulse with a duration of ~10 s,\nfollowed by a weak tail seen up to T-T0 ~60 s.\n\nThe spectrum of the pulse integrated from T0 to T0+8.448 s\nis well fitted (in the 20 keV - 2 MeV range)\nby a power law with exponential cutoff model:\ndN/dE ~ E^(-alpha) * exp(-(2-alpha)*E/Ep)\nwith alpha = 1.22(-0.14, +0.12)\nand Ep = 777 (-237, +549) keV (chi2 = 58/59 dof).\nThe fluence of this part is 9.93(-4.14, +0.69)x10^-6 erg/cm2\n(in the 20 keV - 2 MeV range).\n\nThe spectrum of the tail integrated from T0+8.448 s to T0+57.600 s\ncan be fitted (in the 20 keV - 2 MeV range)\nby a simple power law with the photon\nindex 1.93(-0.27, +0.32) (chi2 = 77/60 dof).\nThe fluence of this part is 3.43(-2.20, +0.83)x10^-6 erg/cm2\n(in the 20 keV - 2 MeV range).\nWe note that because of the derived photon index is ~2,\nthis fluence value is very sensitive to the upper boundary\nof the energy range.\n\nThe total burst fluence is 1.34(-0.47, +0.11)x10^-5 erg/cm2,\nand the 256-ms peak flux measured from T0+0.608 s\n3.72(-1.62, +0.53)x10^-6  erg/cm2/s\n(both in the 20 keV - 2 MeV energy range).\n\nAll the quoted errors are at the 90% confidence level.",
  "circularId": 5748,
  "createdOn": 1161613378000,
  "email": "val@mail.ioffe.ru",
  "subject": "Konus-Wind observation of GRB 061021",
  "submitter": "Valentin Pal'shin at Ioffe Inst  <val@mail.ioffe.ru>",
  "eventId": "GRB 061021"
}