TITLE: GCN CIRCULAR NUMBER: 19288 SUBJECT: Konus-Wind observation of GRB 160410A (short/hard) DATE: 16/04/11 14:38:02 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 GRB 160410A (Swift/BAT observation: Gibson et al., GCN 19271; Sakamoto et al., GCN 19276) triggered Konus-Wind at T0=18592.644 s UT (05:09:52.644). The light curve shows a short, hard pulse with a total duration is ~2 s. The emission is seen up to ~4 MeV. As observed by Konus-Wind, the burst had a fluence of (1.20 ± 0.3)x10^-5 erg/cm2 and a 16-ms peak energy flux, measured from T0-0.016, of (2.8 ± 0.4)x10^-5 erg/cm2 (both in the 20 keV - 10 MeV energy range). The spectrum of the burst (measured from T0 to T0+8.448 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 = -0.71(-0.20,+0.26), and the peak energy Ep = 1416(-356,+528) keV, chi2 = 92/97 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 = 92/96 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160410_T18592/ Assuming the redshift z=1.717 (Selsing et al., GCN 19274) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~4.0x10^52 erg, the peak luminosity L_iso is ~7.5x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~4660 keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.