TITLE: GCN CIRCULAR NUMBER: 11659 SUBJECT: Konus-Wind observation of GRB 110205A DATE: 11/02/07 11:34:21 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team report: The long GRB 110205A (Swift-BAT trigger #444643: Beardmore et al., GCN 11629; Markwardt et al., GCN 11646) was detected by Konus-Wind in the waiting mode. The burst light curve shows a multipeaked pulse started at ~T0(BAT) with a total duration of ~330 s. There is a weak pulse at ~T0(BAT)-1360 s (seen by the same detector which observed GRB 110205A; the detection significance is ~4.5 sigma in the G1+G2 (20-360 keV) band; the pulse duration is ~25 s), which might be a burst precursor. There is a hint of a weak soft tail seen up to ~T0+1200 s. As observed by Konus-Wind, the burst had a fluence of (3.66 +/- 0.35)x10^-5 erg/cm2 and a 3-s peak flux measured from T0+211.6 s of (5.1 +/- 0.7)x10^-7 erg/cm2/s (both in the 20 - 1200 keV energy range). Modeling the K-W 3-channel time-integrated spectrum (from T0 s to T0+330 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.52 +/- 0.14, and Ep = 222 +/- 74 keV. Assuming z = 2.22 (Cenko & Hora, GCN 11638; Vreeswijk et al. GCN 11640) and a standard cosmology model with H_0 = 71 km/s/Mpc, Omega_M = 0.27, Omega_Lambda = 0.73, the isotropic energy release E_iso is (1.36 +/- 0.13)x10^54 erg, the peak luminosity (L_iso)_max is (5.9 +/- 0.8)x10^51 erg/s, and Ep_rest is 715 +/- 238 keV. All the quoted errors are estimated at the 1 sigma confidence level. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB110205A/