TITLE: GCN CIRCULAR NUMBER: 14328 SUBJECT: Konus-Wind observation of GRB 130320A DATE: 13/03/24 12:28:11 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 intense long-duration GRB 130320A (IPN triangulation: Hurley et al., GCN 14327) triggered Konus-Wind at T0=25724.822s UT (07:08:44.822) The light curve shows a double-peaked pulse with a total duration of ~20 s. The emission is seen up to 5 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130320_T25724/ Note: periodic "dips" visible in this light curve are due to the GRB source occultation by the spacecraft structure. As observed by Konus-Wind, the burst had a fluence of (2.6 ± 0.05)x10-5 erg/cm2, and a 64-ms peak flux, measured from T0+0.960 s, of (1.85 ± 0.1)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+22.784 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which: alpha = -0.78 ± 0.05, and Ep = 295 ± 7 keV, chi2 = 85.0/93 dof. The spectrum at the maximum count rate (measured from T0 to T0+2.048 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model, for which: alpha = +0.27 ± 0.06, and Ep = 364 ± 7 keV, chi2 = 91.1/98 dof. All the quoted results are preliminary.