TITLE: GCN CIRCULAR NUMBER: 44286 SUBJECT: Konus-Wind detection of GRB 260410A (short/hard) DATE: 26/04/13 11:52:18 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 260410A (Fermi-GBM detection: Fermi GBM team, GCN Circ. 44252, Hamburg et al., GCN Circ. 44258; Fermi-LAT detection: Holzmann Airasca et al., GCN Circ. 44253; CALET-GBM detection: Ricciarini et al., GCN Circ. 44283) triggered Konus-Wind at T0=25436.09 s UT (07:03:56.090). The burst light curve shows a multipeaked structure, which starts at ~T0-0.1 s and has a total duration of ~0.3 s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB260410_T25436/ As observed by Konus-Wind, the burst had a fluence of 3.36(-0.54,+0.53)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.054 s, of 2.53(-0.69,+0.68)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+0.192 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.06(-0.34,+0.62), the high energy photon index beta = -2.06(-0.51,+0.28), the peak energy Ep = 784(-283,+341) keV (chi2 = 21/27 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/44286. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...