TITLE: GCN CIRCULAR NUMBER: 12135 SUBJECT: Konus-Wind observation of GRB 110709B DATE: 11/07/10 10:56:50 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 110709B (Swift-BAT trigger #456967: Cummings et al., GCN 12122; Barthelmy et al., GCN 12130) triggered Konus-Wind at T0=77564.576s UT (21:32:44.576) The burst light curve shows a multi-peaked pulse with a total duration of ~70 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB110709_T77564/ As observed by Konus-Wind the burst had a fluence of (2.6 ± 0.2)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+13.824 s, of (1.1 ± 0.1)x10-5 erg/cm2/s (both in the 20 keV - 5 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+41.216 s) is best fitted in the 20 keV - 5 MeV range by a power law with exponential cutoff model, for which alpha = -1.0 (-0.13, +0.14), and Ep = 278(-32, +43) keV, chi2 = 62.7/73 dof. The spectrum at the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fitted in the 20 keV - 5 MeV range by a power law with exponential cutoff model, for which alpha = -0.56 (-0.26, +0.30), and Ep = 231(-28, +38) keV, chi2 = 65.9/73 dof. The renewed source activity (Swift-BAT trigger #456969: Barthelmy et al., GCN 12124) fell into the telemetry gap but was recorded by the instrument's spare count rate measurement channel. This low-resolution record (in the 70-300 keV energy range) shows a double-pulsed structure lasting for ~100 s from T0+573 s to T0+675 s (21:42:17 - 21:43:59) and having slightly weaker intensity as compared to the initial burst. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.