TITLE: GCN CIRCULAR NUMBER: 27867 SUBJECT: Konus-Wind observation of GRB 200524A DATE: 20/05/30 14:10:03 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 200524A (Fermi-LAT detection: Fana Dirirsa et al., GCN Circ. 27797; Fermi-GBM detection: Pookalil et al., GCN Circ. 27809; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27818) triggered Konus-Wind at T0=18243.246 s UT (05:04:03.246). The burst light curve shows a multipeaked structure which starts at ~T0-4.8 s, peaks at ~T0-3.3 s, and to background level at ~T0+84 s. The total burst duration is ~89 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200524_T18243/ As observed by Konus-Wind, the burst had a fluence of 3.48(-0.62,+0.74)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+3.280 s, of 6.33(-1.64,+1.75)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+40.704 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.75(-0.18,+0.25), the high energy photon index beta = -2.13(-0.31,+0.20), the peak energy Ep = 215(-46,+48) keV (chi2 = 105/97 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+7.936 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.55(-0.18,+0.26), the high energy photon index beta = -2.14(-0.21,+0.16), the peak energy Ep = 203(-36,+36) keV (chi2 = 130/97 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.