TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4439 SUBJECT: Konus-Wind observation of GRB 060105 DATE: 06/01/06 13:10:21 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The GRB 060105 (Swift-BAT trigger #175942; Ziaeepour et al., GCN 4429; Markwardt et al., GCN 4435) triggered Konus-Wind at T0=24544.371 s UT (06:49:04.371). The Konus-Wind light curve consists of three main multipeaked pulses with a total duration of ~60 sec. As observed by Konus-Wind the burst had a fluence of 7.86(-0.37,+0.19)x10^-5 erg/cm2 and peak flux on 256 msec time scale 6.55(-0.45,+0.19)x10^-6 erg/cm2/sec (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the GRB (from T0 to T0+58.880 sec) 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 = 0.827(-0.044,+0.042) and Ep = 424(-22, +25) keV (chi2 = 63/62dof). It can also be fitted by GRBM (Band) model for which: the low-energy photon index is alpha = -0.790 (-0.052,+0.067), the high energy photon index beta = -2.70(-0.73, +0.35), the break energy E0 = 327 (-46, +40) keV (chi2 = 58/61dof). The spectrum integrated over the most intense part of the GRB (from T0+16.64 to T0+29.184 sec) 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 = 0.571(-0.060,+0.057) and Ep = 549(-31, +34) keV (chi2 = 73/62dof). All the quoted errors are at the 90% confidence level.