TITLE: GCN CIRCULAR NUMBER: 19677 SUBJECT: Konus-Wind observation of GRB 160709A (short/hard) DATE: 16/07/10 13:15:15 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report: The short/hard GRB 160709A (Fermi-LAT detection: Guiriec, et al., GCN Circ. 19675; Fermi-GBM detection: Jenke, GCN Circ. 19676) triggered Konus-Wind at T0=71345.896 s UT (19:49:05.896). The light curve shows a short, hard pulse with a total duration of ~0.4 s. The emission is seen up to ~8 MeV. As observed by Konus-Wind, the burst had a fluence of (1.5 ± 0.3)x10^-5 erg/cm2 and a 16-ms peak energy flux, measured from T0, of (6.3 ± 0.9)x10^-5 erg/cm2 (both in the 20 keV - 10 MeV energy range). The spectrum of the burst (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 10 MeV range by a cutoff power-law (CPL) function with the following model parameters: the photon index alpha = -0.51(-0.17,+0.19), and the peak energy Ep = 2554(-509,+664) keV, chi2 = 40.1/50 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep with only an upper limit on beta of -2.1, chi2 = 39.8/49 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160709_T71345/ All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.