TITLE: GCN CIRCULAR NUMBER: 16389 SUBJECT: Konus-Wind observation of GRB 140611A DATE: 14/06/12 11:53:32 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. Lyssenko, and T. Cline on behalf of the Konus-Wind team, report: The short/hard GRB 140611A (IPN triangulation: Golenetskii at al., GCN 16384; Swift-BAT detection in ground analysis: Cummings, GCN 16386) triggered Konus-Wind at T0=13864.927 s UT (03:51:04.927). The burst light curve starts, at ~T0-0.1, with a rise of short, bright pulse with a duration of ~0.5 s, followed by a weaker, second pulse from ~T0-1.5 s to ~T0+2.2 s. The total duration of the burst is ~2.3 s. The emission is seen up to ~5 MeV. As observed by Konus-Wind, the burst had a fluence of 1.5(-0.3,+0.4)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+0.256 s, of 4.5(-0.5,+0.5)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 18 MeV range by the cutoff power law with the following model parameters: the photon index alpha = -0.68 (-0.18,+0.22), and the peak energy Ep = 1460(-360,+520) keV, chi2 = 111/98 dof. Fitting this spectrum with the Band model yields the same values of alpha and Ep with an upper limit on beta of -2.3. The spectrum near the maximum count rate (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 5 MeV range by the cutoff power law with the following model parameters: the photon index alpha = -0.24(-0.14,+0.16), and the peak energy Ep = 1410(-160,+170) keV, chi2 = 69/68 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140611_T13864/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.