MASTER OT J051529.15+560532.0: stage transition Itoh-san, Crimean Astrophys. Obs. team and Vihorlat Obs. team have reported observations. There was stage B-C transition on Mar. 15. Stage B period was 0.06942(3) with Pdot = +12(3)*10^(-5). The object is currently in stage C and fading rapidly.