TITLE: GCN CIRCULAR NUMBER: 18003 SUBJECT: Konus-Wind observation of GRB 150710A (Swift trigger 648437) DATE: 15/07/10 13:58:12 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The short-duration GRB 150710A (Swift trigger 648437: Bernardini, et al., GCN Circ. 18000) triggered Konus-Wind at T0=1681.682 s UT (00:28:01.682). The burst light curve shows a short, double-peaked pulse with a total duration of ~0.1 s. As observed by Konus-Wind, the burst had a fluence of (3.7 ± 0.7)x10^-7 erg/cm2, and a 16-ms peak flux, measured from T0-0.048 s, of (7.6 ± 1.5)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the bulk of the burst emission was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modeling the 3-channel time-integrated spectrum (from T0-0.048 s to T0+0.048 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.28 ± 0.54, and Ep = 308 ± 70 keV. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB150710_T01681/ Following Bernardini, et al. (GCN Circ. 18000), we note, that the burst, as observed by Konus-Wind, is comparable in hardness and other aspects to a typical short GRB from the KW sample. The figure showing the GRB 150710A position in the hardness-duration diagram (logT50-logHR32) of 1143 KW bright GRBs is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB150710_T01681/HR32vsT50.png The contours denote the 1, 2, and 3 sigma confidence regions for two-dimensional Gaussian distributions. The vertical dashed line at T50=0.6 s marks the boundary between short and long KW GRBs. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.