TITLE: GCN CIRCULAR NUMBER: 44475 SUBJECT: Konus-Wind detection of a burst from SGR 1E1841-045 on 2026 May 2 DATE: 26/05/05 15:28:39 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru> A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: A bright burst from SGR 1E1841-045 (IPN triangulation: Ridnaia et al., GCN 44448; SVOM-GRM detection: Zao et al., GCN 44450) triggered Konus-Wind at T0=20396.052 s UT (05:39:56.052) on 2026 May 2. The burst light curve shows a single pulse, which starts at ~T0-50 ms and has a total duration of ~96 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/260502_T20396/ As observed by Konus-Wind, the burst had a fluence of 8.64(-0.45,+0.46)x10^-7 erg/cm2, and a 16-ms peak flux, measured from T0-0.004 s, of 1.93(-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 - 500 keV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = 0.16(-0.69,+0.76) and Ep = 48(-4,+3) keV (chi2 = 12/15 dof). All the quoted errors are at the 68% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/44475. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...