TITLE: GCN CIRCULAR NUMBER: 39386 SUBJECT: Konus-Wind detection of GRB 250217C (short) DATE: 25/02/20 14:18:00 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 short-duration GRB 250217C (Fermi-GBM detection: The Fermi GBM team, GCN 39357; Smith, GCN 39367; AstroSat-CZTI detection: Tembhurnikar et al., GCN 39359; IPN triangulation: Kozyrev et al., GCN 39365; SVOM-GRM detection: Wang et al., GCN 39369) triggered Konus-Wind at T0=86086.280 s UT (23:54:46.280). The burst light curve shows a multipeaked structure which starts at ~T0 and has a total duration of ~0.3 s. The emission is seen up to ~4 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB250217_T86086/ As observed by Konus-Wind, the burst had a fluence of 2.76(-0.35,+0.38)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.190 s, of 2.38(-0.47,+0.49)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+0.256 s) is best fit in the 20 keV - 4 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.27(-0.49,+0.70), the high energy photon index beta = -1.93(-0.11,+0.09), the peak energy Ep = 116(-26,+40) keV (chi2 = 47/37 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/39386. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...