TITLE: GCN CIRCULAR NUMBER: 38323 SUBJECT: Konus-Wind detection of GRB 241115D / EP 241115a DATE: 24/11/26 15:15:20 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 241115D / EP 241115a (EP-WXT detection: Hu et al., GCN 38239; SVOM-GRM detection: Wang et al., GCN 38250) was detected by Konus-Wind (KW) in the waiting mode at T0(GRM) ~20736 s UT (05:45:36). A Bayesian block analysis of the KW waiting mode data in the 20-300 keV band reveals a >30 sigma count rate increase in the interval from T0(GRM)-68 s to ~T0(GRM)+35 s. The total burst duration is ~103 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241115D/ The total burst fluence is 1.54(-0.21,+0.24)x10^-5 erg/cm^2, and the 2.944 s peak energy flux, measured from T0-0.138 s, is 7.10(-1.8,+1.4)x10^-7 erg/cm^2. (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst, measured from T0-68 s to T0+35 s, can be described by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.74(-0.19,+0.53) and Ep = 102(-38,+24) keV. The spectrum near the peak count rate, measured from T0-3.082 s to T0+2.806 s, can be described by a CPL model with alpha ~-1.3 and Ep = 121(-22,+29) keV. 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/38323. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...