TITLE: GCN CIRCULAR NUMBER: 24044 SUBJECT: Konus-Wind observation of GRB 190329A DATE: 19/04/03 12:52:21 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration, bright GRB 190329A (IPN triangulation: Hurley et al., GCN Circ. 24029; CALET-GBM detection: Yamaoka et al., GCN Circ. 24033) triggered Konus-Wind at T0=22905.458 s UT (06:21:45.458). The burst light curve shows two separated multi-peaked emission episodes. The first episode starts at ~T0-0.3 s and has a duration of ~2 s; the second starts at ~T0-10.3 s and has a duration of ~8 s. The emission is seen up to ~3 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190329_T22905/ As observed by Konus-Wind, the burst had a fluence of 2.20(-0.14,+0.16)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+11.168 s, of 1.31(-0.16,+0.16)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+15.104 s) is best fit in the 20 keV - 3 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.15(-0.08,+0.09) and Ep = 345(-39,+50) keV (chi2 = 73/65 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.0 (chi2 = 73/64 dof). The spectrum near the maximum count rate (measured from T0+8.448 to T0+15.104 s) is best fit in the 20 keV - 3 MeV range by a power law with exponential cutoff model: with alpha = -1.01(-0.11,+0.11) and Ep = 252(-24,+30) keV (chi2 = 80/67 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.1 (chi2 = 80/66 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.