Аннотация:MASTER-Amur(twin 40cm robotic telescope of MASTER Global Robotic Net (Lomonosov MSU), that is located near Cosmodrom Vostochniy) started alert observations of Fermi GRB 200412B / trigger 606840801 (Fermi GCN #27547, BALROG GCN #27548) at 2020-04-12 11:32:08 UT just after sunset (Lipunov et al. GCN #27549, GCN #27555 https://master.sai.msu.ru/site/master2/event.php?id=1335007 ) During inspect MASTER-Amur auto-detection system ( Lipunov et al., “MASTER Global Robotic Net”, Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 18h 33m 15.33s +62d 31m 57.0s on 2020-04-12.48156 UT in Fermi error box (GCN 27547, 27548) Lipunov et al., GCN 27549).