TITLE: GCN CIRCULAR NUMBER: 13158 SUBJECT: Konus-Wind observation of GRB 120328B DATE: 12/03/28 15:07:31 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 intense GRB 120328B (IPN localization: Hurley at al., GCN 13157) triggered Konus-Wind at T0=23186.645s UT (06:26:26.645) The light curve shows two main overlapping pulses which peaks are separated by ~15 s. A total burst duration of the burst ~50 s. The emission is seen up to ~8 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120328_T23186/ As observed by Konus-Wind the burst had a fluence of (1.2 ± 0.1)x10-4 erg/cm2, and a 256-ms peak flux, measured from T0+4.352 s, of (1.5 ± 0.2)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+50.176 s) is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha = -1.08 (-0.07, +0.07), the high energy photon index beta = -2.2 (-0.2, +0.1), the peak energy Ep = 267(-30, +36) keV, chi2 = 111/86 dof. The spectrum at the maximum count rate (measured from T0+0.256s to T0+4.864 s) is best fitted is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha = -0.59 (-0.11, +0.09), the high energy photon index beta = -2.2 (-0.2, +0.1), the peak energy Ep = 430(-54, +66) keV, chi2 = 90.4/82 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.