TITLE: GCN CIRCULAR NUMBER: 6879 SUBJECT: Konus-Wind observation of GRB 071010B DATE: 07/10/11 11:23:47 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 long GRB 071010 (Swift-BAT trigger #293795: Markwardt et al., GCN 6871, 6877) triggered Konus-Wind at T0=74748.490 s UT (20:45:48.490). The burst light curve shows a single pulse with a duration of ~15 s, followed by a weak soft tail seen up to T-T0 ~50 s. There is a hint of the pretrigger pulse detected by BAT (Markwardt et al., GCN 6877) in the Konus-Wind soft energy band (18-70 keV). As observed by Konus-Wind the burst had a fluence of 4.78(-3.12, +0.95)x10^-6 erg/cm2, and a 64-ms peak flux measured from T0+1.6 s of 8.92(-5.99, +2.29)x10^-7 erg/cm2/s (both in the 20 keV - 1 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+16.640 s) can be fitted (in the 20 keV - 1 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -1.25 (-0.49, +0.74), the high energy photon index beta = -2.65(-0.49, +0.29), the peak energy Ep = 52 (-14, +10) keV (chi2 = 69.1/55 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB071010_T74748/