ASASSN-15sn superoutburst YYYYMMDD(UT) mag observer 20181007.5302 <161c (Yutaka Maeda) 20181008.5391 <154c (Yutaka Maeda) 20181008.556 <165c (Mitsutaka Hiraga) 20181012.6688 <144c (Yutaka Maeda) 20181013.526 151c (Mitsutaka Hiraga) 20181013.6246 153c (Yutaka Maeda) 20181016.6124 152cG (Yutaka Maeda)