TITLE: GCN CIRCULAR NUMBER: 17074 SUBJECT: Konus-Wind observation of GRB 141118A DATE: 14/11/20 13:58:43 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: A long-duration GRB 141118A (IPN triangulation: Hurley et al., GCN 17073) triggered Konus-Wind at T0=58548.540 s UT (16:15:48.540). The KW light curve shows a single emission episode lasting from ~T0-0.5 s to ~T0+5 s. The emission in this episode is visible up to ~2 MeV. As observed by Konus-Wind, the burst had a fluence of 2.3(-0.5,+1.4)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0, of 1.6(-0.4,+1.0)x10^-6 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 - 15 MeV range by the cutoff power law with the following model parameters: the photon index alpha = -1.14(-0.67,+0.89), and the peak energy Ep = 165(-55,+198) keV, chi2 = 95/97 dof. Fitting this spectrum with the Band model yields the same values of alpha and Ep and an upper limit on beta of -2.0 The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB141118_T58548/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.