TITLE: GCN CIRCULAR NUMBER: 16046 SUBJECT: Konus-Wind observation of GRB 140329A DATE: 14/03/30 16:56:28 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, and T. Cline on behalf of the Konus-Wind team, report: A long-duration, very intense GRB 140329A (Fermi-GBM detection: von Kienlin & Younes, GCN 16042; IPN triangulation: Hurley at al., GCN 16045) triggered Konus-Wind at T0=25481.877 s UT (07:04:41.877). The burst light curve starts with a short pulse at ~T0 followed by a bright multi-peaked complex from ~T0+19 s to ~T0+30 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of 8.5(-0.7,+0.7)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+23.744 s, of 2.7(-0.3,+0.3)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+33.024 s) is best fit in the 20 keV - 18 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -1.04 (-0.09,+0.11), the high energy photon index beta = -2.30 (-0.17,+0.11), the peak energy Ep = 238 (-28,+32) keV, chi2 = 132/95 dof. The spectrum near the maximum count rate (measured from T0+23.296 to T0+23.808 s) is best fit in the 20 keV - 18 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.90 (-0.11,+0.13), the high energy photon index beta = -2.7 (-1.1,+0.3), the peak energy Ep = 388 (-66,+75) keV, chi2 = 68.0/80 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140329_T25481/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.