TITLE: GCN CIRCULAR NUMBER: 35508 SUBJECT: Konus-Wind detection of GRB 240101C DATE: 24/01/09 15:07:11 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 short-duration GRB 240101C (Fermi-GBM detection: The Fermi GBM team, GCN 35451; Bala et al., GCN 35488; GRBAlpha detection: Dafcikova et al., GCN 35459; AstroSat-CZTI detection: Navaneeth et al., GCN 35478; Swift-BAT/GUANO detection: DeLaunay et al., GCN 35482; IPN triangulation: Svinkin et al., GCN 35489) triggered Konus-Wind at T0=46643.329 s UT (12:57:23.329). The burst light curve shows a single pulse which starts at ~T0-0.1 s 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/GRB240101_T46643/ As observed by Konus-Wind, the burst had a fluence of 1.39(-0.19,+0.21)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0-0.002 s, of 1.57(-0.41,+0.43)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 - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.19(-0.41,+0.52) and Ep = 326(-56,+80) keV (chi2 = 15/22 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.4 (chi2 = 15/21 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/35508. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...