Аннотация:MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 211023B ( S. Dichiara et al., GCN 30960) errorbox 631 sec after notice time and 655 sec after trigger time at 2021-10-23 21:16:47 UT, with upper limit up to 15.2 mag. The observations began at zenith distance = 89 deg. The sun altitude is -58.3 deg. The galactic latitude b = 68 deg., longitude l = 175 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1762968 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_______________ ______|_____|_______|______|______ __ 721 | MASTER-Kislovodsk | P- | 130 | 14.5 | 874 | MASTER- Kislovodsk | P- | 160 | 14.9 | 1252 | MASTER-Kislovodsk | P- | 180 | 15.2 | The observation and reduction will continue. The message may be cited.