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 210930A ( V. D’Elia et al., GCN 30897) errorbox 48786 sec after notice time and 48953 sec after trigger time at 2021-09-30 16:22:45 UT, with upper limit up to 17.2 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -11.0 deg. The galactic latitude b = 68 deg., longitude l = 114 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1737711 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_______________ ______|_____|_______|______|______ __ 32055 | MASTER- | C | 1 | 14.1 | 32055 | MASTER- | C | 1 | 15.1 | 36978 | MASTER- | C | 180 | 20.0 | 49043 | MASTER-Tavrida | C | 180 | 17.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.