TITLE: GCN CIRCULAR NUMBER: 44461 SUBJECT: Konus-Wind detection of GRB 260411C DATE: 26/05/04 19:38:56 GMT FROM: Valentina Panteleeva at Ioffe Institute <panteleevav228@gmail.com> V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 260411C triggered Konus-Wind at T0=21236.871 s UT (05:53:56.871). The burst light curve shows a single pulse which starts at ~T0-14.9 s and has a total duration of ~24.3 s. The emission is seen up to ~1 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB260411_T21236/ As observed by Konus-Wind, the burst had the total fluence of 1.31(-0.08,+0.08)x10^-5 erg/cm2, and the 64-ms peak flux, measured from T0+1.584 s, of 7.72(-0.94,+0.93)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 the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.54(-0.09,+0.08), the high energy photon index beta = -3.23(-6.77,+0.37), the peak energy Ep = 105(-6,+8) keV (chi2 = 85/81 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/44461. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...