TITLE: GCN CIRCULAR NUMBER: 16213 SUBJECT: Konus-Wind observation of GRB 140423A DATE: 14/05/05 07:43:26 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team report: The long GRB 140423A (Swift-BAT trigger #596901: Sonbas, et al., GCN Circ. 16142, Cummings, et al., GCN Circ. 16161) was detected by Konus-Wind in the waiting mode. The burst light curve shows a single episode started at ~T0(BAT)-46 s with a duration of ~130 s. As observed by Konus-Wind, the burst had a fluence of 1.87(-0.17,+0.13)x10^-5 erg/cm2 (in the 20 - 1200 keV energy range). Modeling the K-W 3-channel time-integrated spectrum (from T0(BAT)-46 s to T0(BAT)+84 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.1 +/- 0.1, and Ep = 196(-20,+30) keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary. The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB140423A/