TITLE: GCN CIRCULAR NUMBER: 16897 SUBJECT: Konus-Wind observation of GRB 141005A DATE: 14/10/06 18:30:02 GMT FROM: Anastasia Tsvetkova 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 long-duration GRB 141005A (Swift-BAT trigger 614415: D'Elia, GCN 16882; Krimm et al., GCN 16893; Fermi-GBM detection: Roberts, GCN 16889) triggered Konus-Wind at T0=18787.727 s UT (05:13:07.727). The burst light curve shows a single pulse with a duration of ~3 s. The emission is seen up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 2.3(-0.2,+0.3)x10^-6 erg/cm2, and a 64-ms peak energy flux, measured from T0+0.390 s, of 1.6(-0.5,+0.5)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.34(-0.49,+0.58), and Ep = 104(-14,+18) keV (chi2 = 33/55 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.37 (chi2 = 31/54 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB141005_T18787/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.