TITLE: GCN CIRCULAR NUMBER: 22722 SUBJECT: Konus-Wind observation of GRB 180510A DATE: 18/05/14 11:16:13 GMT FROM: Anastasia Tsvetkova at Ioffe Institute A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 180510A (Swift detection of a burst: Gropp et al., GCN 22695; Ukwatta et al., GCN 22704) triggered Konus-Wind at T0=69881.488 s UT (19:24:41.488). The burst light curve shows a single pulse which starts at ~T0-6.4 s and has a total duration of ~23.5 s. The emission is seen up to ~1 MeV. As observed by Konus-Wind, the burst had a fluence of 1.07(-0.14,+0.21)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0-0.064 s, of 3.53(-1.13,+1.18)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+16.640 s) is best fit in the 20 keV - 1.5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with  alpha = -1.14(-0.31,+0.38), and Ep = 237(-56,+126) keV (chi2 = 93/60 dof). Fitting by the GRB (Band) model yields alpha = -0.62(-0.66,+1.24), Ep = 150(-54,+131) keV, and an upper limit on the high energy photon index: beta < -1.90 (chi2 = 91/59 dof). The spectrum near the peak count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1 MeV range by a power law with exponential cutoff model with  alpha = -0.97(-0.30,+0.35), and Ep = 202(-34,+54) keV (chi2 = 75/50 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.37 (chi2 = 75/49 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180510_T69881/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.