TITLE: GCN CIRCULAR NUMBER: 6230 SUBJECT: Konus-Wind observation of GRB 070328 DATE: 07/03/29 14:06:43 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline on behalf of the Konus-Wind team report: The long GRB 070328 (Swift-BAT trigger #272773: Markwardt et al., GCN 6224; Stamatikos et al., GCN 6225), triggered Konus-Wind at T0=14029.993 s UT (03:53:49.993). The Konus-Wind light curve shows multipeaked structure with a duration of ~45 s, followed by a weak tail marginally seen up to T-T0~130 s in the 70-300 keV band. As observed by Konus-Wind the burst had a fluence of 5.95(-0.76, +1.06)x10^-5 erg/cm2, and the 256-ms peak flux measured from T0+1.808 s 4.57(-0.91, +1.07)x10^-6 erg/cm2/s (both in the 20 keV - 6 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+41.216 s) is well fitted (in the 20 keV - 6 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -0.99(-0.11, +0.13), the high energy photon index beta = -1.99(-0.40, +0.18), the peak energy Ep = 496(-117, +172) keV (chi2 = 80/77 dof). Fitting by a power law with exponential cutoff model: dN/dE ~ E^(-alpha) * exp(-(2-alpha)*E/Ep) yields alpha = 1.09 +/- 0.08, and Ep = 688(-119, +173) keV (chi2 = 88/78 dof). All the quoted errors are at the 90% confidence level. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB070328_T14029/