TITLE: GCN CIRCULAR NUMBER: 38297 SUBJECT: Konus-Wind detection of GRB 241120A DATE: 24/11/22 14:38:03 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 long-duration GRB 241120A (Fermi-GBM detection: Fermi GBM team, GCN 38279; Hamburg & Meegan, GCN 38285; INTEGRAL (IBIS/ISGRI) detection: Gotz et al., GCN 38280; CALET (CGBM) detection: Cherry et al., GCN 38295) triggered Konus-Wind at T0=21240.717 s UT (05:54:00.717). The burst light curve shows a single pulse, which starts at ~T0-1.9 s and has a total duration of ~2.9 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB241120_T21240/ As observed by Konus-Wind, the burst had a fluence of 3.55(-0.48,+0.59)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.372 s, of 4.98(-1.17,+1.30)x10^-6 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 = -0.91(-0.29,+0.34) and Ep = 267(-56,+95) keV (chi2 = 80/78 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.6 (chi2 = 80/77 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/38297. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...