TITLE: GCN CIRCULAR NUMBER: 8015 SUBJECT: Konus-Wind observation of GRB 080723B DATE: 08/07/25 11:33:12 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The bright GRB 080723B localized by IBIS/ISGRI (Gotz et al., GCN 8002) and SuperAGILE (Del Monte et al., GCN 8003) triggered Konus-Wind at T0=48143.773 s UT (13:22:23.773). The burst light curve shows multipeaked structure with a duration of ~100 s. As observed by Konus-Wind the burst had a fluence of 8.40(-0.56, +0.47)x10^-5 erg/cm2, and a 64-ms peak flux measured from T0+54.784 s of (1.11 +/- 0.15)x10^-5 erg/cm2/s (both in the 20 keV - 2 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+87.808 s) is well fitted (in the 20 keV - 2 MeV range) by GRBM (Band) model for which: the low-energy photon index is alpha = -0.755 (-0.102, +0.103), the high energy photon index beta = -2.42(-0.40, +0.18), the peak energy Ep = 225(-21, +27) keV (chi2 = 64.2/58 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/GRB080723_T48143/