TITLE: GCN CIRCULAR NUMBER: 16929 SUBJECT: Konus-Wind observation of GRB 141017A DATE: 14/10/20 10:22:18 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 141017A (Swift-BAT trigger 615672: Marshall et al., GCN 16919; Markwardt et al., GCN 16927) triggered Konus-Wind at T0=66374.721 s UT (18:26:14.721), or ~46 s after the BAT trigger. The KW light curve shows two episodes of the emission. The first, weaker episode, which triggered BAT, starts at ~T0-47 s and ends at ~T0-42 s. The second, much more brighter episode, which triggered KW, shows a double-peaked pulse from ~T0-3 s to ~T0+7 s. The emission in this episode is visible up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 4.0(-0.5,+0.5)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.704 s, of 1.8(-0.2,+0.2)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the second episode (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1.5 MeV range by the cutoff power law with the following model parameters: the photon index alpha = -0.89(-0.28,+0.31), and the peak energy Ep = 97(-10,+12) keV, chi2 = 73/60 dof. Fitting this spectrum with the Band model yields the same values of alpha and Ep and an upper limit on beta of -3.0 The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB141017_T66374/ All the quoted errors are at the 95% confidence level. All the quoted values are preliminary.