//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 10597 SUBJECT: Konus-Wind observation of GRB 100414B DATE: 10/04/15 13:11:12 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long bright hard GRB 100414B (localized by Fermi-LAT; Takahashi et al., GCN 10594) triggered Konus-Wind at T0=08427.289s UT (02:20:27.289) The burst light curve consists of a single slowly rising pulse which ends abruptly after a culmination at T0+22.528. A total duration of the burst is ~25 s. No spectral evolution is apparent in the course of the burst. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB100414_T08427/ As observed by Konus-Wind the burst had a fluence of 1.06(+/-0.06)x10-4 erg/cm2, and a 256-ms peak flux measured from T0+22.528s of 8.6(+/-0.6)x10-6 erg/cm2/s (both in the 20 keV - 5 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+25.856 s) is well fitted in the 20 keV - 5 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -0.46 (-/+0.07), the high energy photon index beta = -3.2(-1.5, +0.4), the peak energy Ep = 547(-21, +22)keV (chi2 = 97/76 dof). The spectrum at the maximum count rate (measured from T0+19.200 to T0+25.586 s) is best fit in the 20 keV - 5 MeV range by a power law with exponential cutoff model, for which alpha = -0.81(+/-0.1), and Ep = 595(-62, +75) keV (chi2 = 75/77 dof). All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.