TITLE: GCN CIRCULAR NUMBER: 7137 SUBJECT: Konus-Wind and Konus-A observations of GRB 071125 DATE: 07/11/28 14:45:34 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov and T. Cline on behalf of the Konus-Wind and Konus-A teams report: The bright GRB 071125 (Golenetskii et al., GCN 7136) triggered Konus-Wind at T0=50197.159 s UT (13:56:37.159). This burst also triggered Konus-A (Cosmos 2421) at T0=50202.287 s UT (13:56:42.287). As observed by Konus-Wind the burst had a fluence of 7.42(-0.22, +0.31)x10^-5 erg/cm2, and a 16-ms peak flux measured from T0+2.784 s of 2.29(-0.36, +0.37)x10^-5 erg/cm2/s (both in the 20 keV - 3 MeV energy range). The burst shows strong spectral evolution. The time-integrated spectrum of the burst (from T0 to T0+15.616 s) is well fitted (in the 20 keV - 3 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -0.62 +/- 0.05, the high energy photon index beta = -3.10(-0.41, +0.25), the peak energy Ep = 299 +/- 13 keV (chi2 = 78.6/67 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind and Konus-A light curves of this GRB are available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB071125_T50197/