TITLE: GCN CIRCULAR NUMBER: 13100 SUBJECT: Konus-Wind observation of GRB 120324A DATE: 12/03/24 17:02:59 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 GRB 120324A (Swift-BAT trigger #518507: Zhang et al., GCN 13090; Cummings et al., GCN 13096) triggered Konus-Wind at T0=21550.757s UT (05:59:10.757) The light curve shows multiple peaks with a total burst duration of ~65 s. The emission is seen up to ~9 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120324_T21550/ As observed by Konus-Wind the burst had a fluence of (4.5 ± 1.2)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+0.768 s, of (3.7 ± 0.9)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+41.216 s) is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha = -1.02 (-0.10, +0.11), the high energy photon index beta = -2.3 (-1.0, +0.3), the peak energy Ep = 445(-80, +117) keV, chi2 = 82.3/86 dof. The spectrum at the maximum count rate (measured from T0 to T0+8.448 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 = -0.87 (-0.12, +0.15), the high energy photon index beta = -2.6 (<-2.1), the peak energy Ep = 504(-103, +135) keV, chi2 = 90.9/86 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.