TITLE: GCN CIRCULAR NUMBER: 22094 SUBJECT: Konus-Wind observation of GRB 171102A DATE: 17/11/03 22:18:16 GMT FROM: Anastasia Tsvetkova at Ioffe Institute A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report: The long-duration, intense GRB 171102A (Fermi-LAT detection: Yassine et al., GCN 22081; Fermi GBM detection: Stanbro et al., GCN 22083; IPN Triangulation: Kozlova et al., GCN 22091) triggered Konus-Wind at T0=9247.579 s UT (02:34:07.579). The burst light curve shows two emission episodes with a total duration of ~28 s. The emission is seen up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 2.96(-0.32,+0.27)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+14.608 s, of 5.87(-0.95,+0.96)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+21.760 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.76(-0.11,+0.11), the high energy photon index beta = -2.98(-3.40,+0.31), the peak energy Ep = 174(-12,+16) keV, chi2 = 90/97 dof. The spectrum near the peak count rate (measured from T0+8.448 to T0+16.128 s) is best fit in the 20 keV - 1.2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with  alpha = -0.91(-0.12,+0.12), and Ep = 203(-17,+21) keV (chi2 = 56/60 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.52 (chi2 = 56/59 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB171102_T09247/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.