TITLE: GCN CIRCULAR NUMBER: 17155 SUBJECT: Konus-Wind observation of GRB 141207A DATE: 14/12/09 15:28:39 GMT FROM: Valentin Pal'shin at Ioffe Inst 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, hard-spectrum GRB 141207A (Fermi-LAT detection: Arimoto et al., GCN 17146; Fermi-GBM detection: Burns, GCN Circ. 17150) triggered Konus-Wind at T0=69081.298 s UT (19:11:21.298). The burst light curve shows two pulses started at ~T0-2.3 s with a total duration of ~25 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB141207_T69081/ As observed by Konus-Wind, the burst had a fluence of 4.87(-0.34,+0.38)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+6.224 s, of 9.62(-2.26,+2.27)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+24.832 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.50 (-0.13,+0.14) and Ep = 723(-72,+87) keV (chi2 = 105/98 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.6 (chi2 = 104/97 dof) All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.