Аннотация:MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru ) automatically was pointed (Lipunov et al. GCN #29156, GCN #29157) to the Swift GRB201223A (Gropp,Barthelmy et al. GCN #29158) 33 sec after notice time and 51 sec after trigger time at 2020-12-23 17:59:18 UT. MASTER auto-detection system ( Lipunov et al., “MASTER Global Robotic Net”,Advances in Astronomy, 2010, 30L ) discovered optical counterpart of this GRB at RA,Dec(2000) = 08 51 09.22 +71 10 47.8 (Lipunov et al. GCN #29157, TNS 2020adna).