TITLE: GCN CIRCULAR NUMBER: 38304 SUBJECT: Konus-Wind detection of GRB 241117A DATE: 24/11/24 15:43:17 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru> V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration (or possible short GRB with extended emission; Fermi-GBM detection: The Fermi GBM Team, GCN 38258; Scotton and Meegan, GCN 38265; SVOM-GRM observation: Wang et al., GCN 38266; Swift-BAT/GUANO detection: Ronchini et al., GCN 38273; IPN triangulation: Kozyrev et al., GCN 38300) triggered Konus-Wind at T0=10845.029 s UT (03:00:45.029). The burst light curve shows the initial short-duration, bright multipeaked emission episode which starts at ~T0-0.2 s and has a total duration of ~1.8 s, followed by a weaker emission traced up to ~77 s. The emission is seen up to ~5 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241117_T10845/ As observed by Konus-Wind, the burst initial pulse had a fluence of 1.24(-0.16,+0.34)x10^-5 erg/cm2, and a 16-ms peak flux, measured from T0+0.132 s, of 1.72(-0.53,+0.67)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the initial episode (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 16 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.39(-0.27,+0.40), the high energy photon index beta = -3.54(-6.46,+1.20), the peak energy Ep = 733(-178,+204) keV (chi2 = 50/79 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/38304. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...