TITLE: GCN CIRCULAR NUMBER: 30866 SUBJECT: Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22 DATE: 21/09/23 12:31:24 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru> A. Ridnaia, D. Frederiks, S. Golenetskii, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report: A short, soft, SGR-like burst triggered Konus-Wind on 2021 September 22 at T0=72739.639 s UT (20:12:19.639). The Konus-Wind ecliptic latitude response is consistent with the SGR 1935+2154 position. So, taking in account the ongoing bursting activity of this source, burst time history, and softness of its spectrum (as observed by Konus-Wind), we suggest that this burst is likely originated from SGR 1935+2154. The burst light curve shows a single pulse started at ~T0-100 ms with a total duration of ~172 ms. The emission is seen up to ~200 keV. The Konus-Wind light curve of this burst is available at http://www.ioffe.ru/LEA/SGRs/210922_T72739/ As observed by Konus-Wind, the burst had a fluence of 1.46(-0.08,+0.08)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.024 s, of 1.59(-0.16,+0.16)x10^-5 erg/cm2/s (both in the 20 - 500 keV energy range). The spectrum of the burst (measured from T0 to T0+0.064 s) is best fit in the 20 - 200 keV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.13(-0.76,+0.85) and Ep = 37(-6,+4) keV (chi2 = 12/14 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.