ASASSN-15mt superoutburst YYYYMMDD(UT) mag observer 20200320.7590 <148c (Yutaka Maeda) 20200320.7839 <145cG (Tomohito Ohshima) 20200322.8558 <151c (Yutaka Maeda) 20200328.4902 17.302zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20200401.7958 138cG (Yutaka Maeda)