TITLE: GCN CIRCULAR NUMBER: 40914 SUBJECT: GRBs 250702B,C,D,E / EP250702a: Konus-Wind detection of a hard X-ray transient activity DATE: 25/07/03 12:51:12 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: On July 2, 2025, Konus-Wind (KW) detected, in the waiting mode, a hard X-ray activity, consistent in time with GRBs 250702B, C, D, E, reported by Fermi-GBM team (GCN 40883, 40885, 40886, 40890, 40891), localized by Swift/BAT-GUANO (GCN 40903), associated with the X-ray transient EP250702a (GCN 40906), and detected by MAXI/GSC (GCN 40910). KW observed multiple overlapped emission episodes in in the time interval from ~12:40 to ~16:50 UT. The emission is clearly visible in all three KW waiting mode energy bands (20-75, 75-300, 300-1250 keV). From our preliminary background estimates, the total duration of the event is >~15.5 ks. The Konus-Wind light curve is available at http://www.ioffe.ru/LEA/GRBs/GRB250702BCDE/ In the 20-1250 keV range, the time-integrated spectrum of the emission is best described by a simple power law (PL) function with the PL photon index of (-1.3 ± 0.06). The total observed fluence in this energy band is (5.95 ± 0.32)x10^-4 erg/cm^2 and the 2.944 s peak energy flux is (5.33 ± 0.29)x10^-7 erg/cm^2/s. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/40914. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...