TITLE: GCN CIRCULAR NUMBER: 16807 SUBJECT: Konus-Wind observation of GRB 140906C DATE: 14/09/09 15:37:27 GMT FROM: Dmitry Svinkin 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 140906C (IPN triangulation: Golenetskii et al., GCN 16801 and Hurley et al., GCN 16805) triggered Konus-Wind at T0=85872.815 s UT (23:51:12.815). The burst light curve shows two peaks with a total duration of ~0.16 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/GRB140906_T85872/ As observed by Konus-Wind, the burst had a fluence of 2.2(-0.5,+0.6)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.064 s, of 4.4(-1.4,+1.7)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+0.128 s) is best fit in the 20 keV - 10 MeV range by a simple power law function with index = -1.76 (-0.11,+0.13) (chi2 = 24.2/23 dof). Fitting by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields the same alpha and a lower limit on the Ep: Ep > 248 keV (chi2 = 22/22 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.