Аннотация:MASTER Global Robotic Net ( Lipunov et al., “MASTER Global Robotic Net”, Advances in Astronomy, 2010, 30L ) started IceCube-211208A (IceCube GCN #31191, S.Barthelmy NASA GCN page, Ttrigger=2021-12-08 20:02:51.1UT, RA,Dec(2000): 114.52 (+2.82d -2.50d); +15.56(+1.81 -1.39) error-box observations 640 sec after notice time and 682 sec after trigger time at 2021-12-08 20:14:13 UT (Lipunov et al. GCN #31190), see cover map https://master.sai.msu.ru/site/master2/event.php?id=1808302 We observed it at MASTER-Amur, MASTER-Kislovodsk, MASTER-IAC, MASTER-SAAO, MASTER-OAFA and analyzed MASTER archive images since 2004 of the sources, that can be related with this event.