TITLE: GCN CIRCULAR NUMBER: 9848 SUBJECT: Konus-Wind observations of GRB 090827 DATE: 09/08/30 15:23:12 GMT FROM: Dmitry Frederiks at Ioffe Institute 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 GRB 090827 (Cummings et al., GCN 9846) triggered Konus-Wind at T0=68787.702 s UT (19:06:27.702) The burst time profile had a FRED-like structure with a duration of ~8 s. The Konus-Wind light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090827_T68787/ As observed by Konus-Wind the burst had a fluence of 3.0(-0.5,+0.6)x10-6 erg/cm2, and a 256-ms peak flux, measured from T0-0.256, of 1.7(-0.5,+0.7)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+8.848 s) is well fitted (in the 20 keV - 2 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.6(-0.45,+0.58), and Ep = 200(-39,+69)keV (chi2 = 62/57 dof). Fitting by the GRB (Band) model yields the same alpha and Ep values with the high energy photon index Beta of -9 (< -2.3) All the quoted values are preliminary. All the quoted errors are at the 90% confidence level.