TITLE: GCN CIRCULAR NUMBER: 22552 SUBJECT: Konus-Wind observation of GRB 180317A DATE: 18/03/27 11:31:50 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The short-duration, hard-spectrum GRB 180317A (IPN triangulation: Svinkin et al., GCN 22521) triggered Konus-Wind at T0=61287.097 s UT (17:01:27.097). The burst light curve shows a single pulse which starts at T0-34 ms and has a total duration of ~74 ms. As observed by Konus-Wind, the burst had a fluence of 9.47(-2.14,+6.93)x10^-7 erg/cm2, and a 16-ms peak flux, measured from T0-0.024 s, of 2.69(-0.71,+2.00)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). Since the most intense part of the burst was detected before the trigger, the spectral analysis was performed using the KW 3-channel light curve data. Modeling the KW 3-channel time-integrated spectrum (from T0-0.034 s to T0+0.040 s) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -0.74(-0.36,+0.51), and Ep = 757(-253,+1050) keV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180317_T61287/ The burst is not seen in the waiting mode data. All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.