TITLE: GCN CIRCULAR NUMBER: 32033 SUBJECT: Konus-Wind detection of GRB 220511A DATE: 22/05/13 13:04:48 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 220511A (AGILE detection: Ursi et al., GCN 32021; AstroSat CZTI detection: Gopalakrishnan et al., GCN 32028; Fermi-GBM observation: Veres & Meegan, GCN 32030) triggered Konus-Wind (KW) at T0=49319.624 s UT (13:41:59.624). The burst light curve shows a single emission pulse, which starts at ~T0-1 s and has a total duration of ~6 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220511_T49319/ As observed by Konus-Wind, the burst had a fluence of (7.8 �� 1.5)x10^-6 erg/cm^2 and a 64-ms peak energy flux, measured from T0 + 0.832 s, of (4.2 �� 0.7)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1.5 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.75 (-0.19,+0.42), the high energy photon index beta = -3.1 (-6.9,+0.8), the peak energy Ep = 159 (-34,+21) keV, chi2 = 57/59 dof. All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.