TITLE: GCN CIRCULAR NUMBER: 35539 SUBJECT: Konus-Wind detection of GRB 240112C DATE: 24/01/15 15:31:10 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 240112C (Swift-BAT detection: Eyles-Ferris et al., GCN 35522; Fermi-GBM detection: Veres at al., GCN 35533; GRBAlpha detection: Dafcikova et al., GCN 34436) triggered Konus-Wind at T0=63441.633 s UT (17:37:21.633). The burst light curve shows a double-peaked structure, which starts at ~T0-0.5 s and has a total duration of ~4 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/GRB240112_T63441/ As observed by Konus-Wind, the burst had a fluence of 3.70(-0.39,+0.46)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+2.384 s, of 3.30(-0.84,+0.88)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 = -1.59(-0.22,+0.26) and Ep = 79(-18,+18) keV (chi2 = 66/74 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.3 (chi2 = 64/73 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/35539. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...