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 210305A ( A. D’Ai et al., GCN 29595) errorbox 17580 sec after notice time and 17602 sec after trigger time at 2021-03-05 23:56:26 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 82 deg. The sun altitude is -39.6 deg. The galactic latitude b = -11 deg., longitude l = 81 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1561780 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_______________ ______|_____|_______|______|______ __ 17632 | MASTER-Kislovodsk | C | 60 | 16.9 | 17713 | MASTER- Kislovodsk | C | 60 | 16.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.