TITLE: GCN CIRCULAR NUMBER: 40889 SUBJECT: Konus-Wind detection of GRB 250627A DATE: 25/07/02 16:17:20 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: The short-duration GRB 250627A (SVOM-GRM detection: Wang et al., GCN 40871; Insight-HXMT detection: Wang et al., GCN 40872; IPN triangulation: Kozyrev et al., GCN 40888) triggered Konus-Wind at T0=60377.861 s UT (16:46:17.861). The burst light curve shows a multipeaked structure which starts at ~T0-0.3 s and has a total duration of ~1.1 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/GRB250627_T60377/ As observed by Konus-Wind, the burst had a fluence of 9.65(-1.16,+1.29)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.420 s, of 2.60(-0.49,+0.52)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+8.448 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.31(-0.21,+0.25) and Ep = 874(-128,+160) keV (chi2 = 73/76 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.7 (chi2 = 73/75 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/40889. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...