TITLE: GCN CIRCULAR NUMBER: 32109 SUBJECT: Konus-Wind detection of GRB 220522B DATE: 22/05/24 20:26:44 GMT FROM: Anna Ridnaia at Ioffe Institute A.Ridnaia, D. Frederiks, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 220522B (IPN triangulation: Kozyrev at al., GCN Circ. 32108) triggered Konus-Wind at T0=1058.258 s UT (00:17:38.258). The burst light curve shows a multipeaked structure which starts at ~T0-4.4 s and has a total duration of ~106.3 s. The emission is seen up to ~4 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB220522_T01058/ As observed by Konus-Wind, the burst had a fluence of 5.49(-1.66,+1.13)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+9.344 s, of 5.76(-2.35,+2.67)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+41.216 s) is best fit in the 20 keV - 4 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.47(-0.53,+0.56), the high energy photon index beta = -1.94(-0.86,+0.15), the peak energy Ep = 230(-60,+197) keV (chi2 = 85/67 dof). The spectrum near the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fit in the 20 keV - 4 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.37(-0.48,+0.94), the high energy photon index beta = -2.18(-0.90,+0.28), the peak energy Ep = 224(-72,+108) keV (chi2 = 73/66 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.