TITLE: GCN CIRCULAR NUMBER: 12627 SUBJECT: Konus-Wind observation of GRB 111205A DATE: 11/12/07 18:48:42 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long hard intense GRB 111205A (localized by IPN: Hurley et al., GCN 12626) triggered Konus-Wind at T0=47450.301 s UT (13:10:50.301) The light curve starts with a hard bright ~20 s long pulse followed by a weaker tail of softer emission. A total duration of the burst is ~85 s. The emission is seen up to ~8 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB111205_T47450/ As observed by Konus-Wind the burst had a fluence of (1.7 � 0.1)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+1.024 s, of (2.2 � 0.25)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+80.384 s) is best fitted in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which alpha = -0.82 (-0.04, +0.04), and Ep = 998 (-70, +77) keV, chi2 = 98.0/85 dof. Fitting by GRB (Band) model yields the same alpha and Ep, and only an upper limit on the high energy photon index: beta < -2.86 (chi2 = 97.2/84 dof). The spectrum at the maximum count rate (measured from T0 to T0+4.352 s) is best fitted in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which alpha = -0.35 (-0.05, +0.05), and Ep = 1120 (-57, +60) keV, chi2 = 68.8/85 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.