TITLE: GCN CIRCULAR NUMBER: 16107 SUBJECT: Konus-Wind observation of GRB 140413A DATE: 14/04/14 12:09:24 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, and T. Cline on behalf of the Konus-Wind team, report: The long GRB 140413A (Swift-BAT trigger #595616: D'Elia et al., GCN 16098; T0(BAT)=00:09:40 UT) was detected by Konus-Wind in the waiting mode. The light curve shows a broad emission pulse which started ~65 s before the BAT trigger, peaked at ~T0(BAT)+80 s, and lasted till ~T0(BAT)+120 s. A possible soft precursor is seen at ~T0(BAT)-950 s in the softest KW energy band, however its association with GRB 140413A is not confirmed yet. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB140413A/ As observed by Konus-Wind, the burst had a fluence of (2.9 ± 0.3)x10^-5 erg/cm2 and a 2.944-s peak energy flux, measured from ~T0(BAT)+80 s, of (5.2 ± 0.5)x10^-7 erg/cm2 (both in the 20 - 10000 keV energy range). Modeling the KW 3-channel time-integrated spectrum (from T0(BAT)-60 s to T0(BAT)+121 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.37 ± 0.11, and Ep = 228 ± 42 keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.