TITLE: GCN CIRCULAR NUMBER: 29514 SUBJECT: Konus-Wind detection of GRB 210212B / ZTF21aakruew DATE: 21/02/16 16:15:34 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 210212B (ZTF OT detection: Yao et al., GCN Circ. 29508; IPN triangulation: Svinkin et al., GCN Circ. 29511) was detected by Konus-Wind (KW) in the waiting mode. The burst light curve shows a single emission episode which starts at about T0=9479 s UT (02:37:59) and has the total duration of ~48 s. The K-W light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB210212_T09477/ As observed by Konus-Wind, the burst had a fluence of 8.7(-1.1,+1.7)x10^-6 erg/cm2 and a 2.944-s peak flux, measured from ~T0, of 6.7(-1.6,+4.8)x10^-7 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The K-W 3-channel time-integrated spectrum (from T0 to T0+48 s) is well described by a cutoff power-law model with alpha = -1.24(-0.23,+0.33) and Ep = 208(-46,+84) keV. All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.