Аннотация:MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 210209A ( S. Laha et al., GCN 29442) errorbox 66257 sec after notice time and 66326 sec after trigger time at 2021-02-10 16:05:10 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -11.3 deg. The galactic latitude b = -8 deg., longitude l = 92 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1543975 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_______________ ______|_____|_______|______|______ __ 66416 | MASTER-Tavrida | C | 180 | 17.5 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.