MASTER OT J154047.67+683151.7 bright outburst? Confirmatory observations are requested. YYYYMMDD(UT) mag observer 20180309.7650 <170c (Yutaka Maeda) 20180310.6955 <166c (Yutaka Maeda) 20180311.7370 <168c (Yutaka Maeda) 20180312.6841 <148c (Yutaka Maeda) 20180313.7328 124c (Yutaka Maeda)