TITLE: GCN CIRCULAR NUMBER: 16379 SUBJECT: Konus-Wind observation of GRB 140610A DATE: 14/06/11 10:31:09 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lyssenko, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 140610A (Swift-BAT trigger #601259: Evans et al., GCN 16375; T0(BAT)=16:31:29 UT) was detected by Konus-Wind in the waiting mode. The light curve shows a broad emission pulse which started ~3 s before the BAT trigger, peaked at ~T0(BAT)+3 s, and lasted till ~T0(BAT)+150 s. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB140610A/ As observed by Konus-Wind, the burst had a fluence of (1.6 ± 0.3)x10^-5 erg/cm2 and a 2.944-s peak energy flux, measured from ~T0(BAT)+3 s, of (2.3 ± 0.3)x10^-7 erg/cm2 (both in the 20 - 10000 keV energy range). Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)-3 s to T0(BAT)+150 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.75 ± 0.15, and Ep = 200 ± 93 keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.