TITLE: GCN CIRCULAR NUMBER: 43413 SUBJECT: Konus-Wind detection of GRB 260114A DATE: 26/01/15 12:44:01 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 260114A (Fermi-GBM detection: Fermi GBM Team, GCN 43395; Bissaldi, GCN 43400; Swift-BAT detection: Eyles-Ferris et al., GCN 43396; GECAM-B observation: Ren et al., GCN 43402; SVOM/GRM observation: Wang et al., GCN 43404) triggered Konus-Wind at T0=42030.729 s UT (11:40:30.729). The burst light curve shows a single pulse which starts at ~T0 s and has a total duration of ~0.3 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/GRB260114_T42030/ As observed by Konus-Wind, the burst had a fluence of 5.12(-0.25,+0.25)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.024 s, of 2.76(-0.33,+0.33)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 = 0.56(-0.15,+0.16) and Ep = 502(-25,+26) keV (chi2 = 36/34 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.4 (chi2 = 36/33 dof). Assuming the redshift z=0.524 (Yang et al., GCN 43410) and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is 3.86(-0.19,+0.19)x10^51 erg, the peak luminosity L_iso is 3.17(-0.38,+0.38)x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is 765(-38,+40) keV. With the obtained estimates, the position of GRB 260114A in both Eiso-Ep,z and Liso-Ep,z planes is consistent with short-hard (Type I) GRB population, see http://www.ioffe.ru/LEA/GRBs/GRB260114_T42030/GRB260114A_rest_frame.pdf 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/43413. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...