ASASSN-13cs superoutburst YYYYMMDD(UT) mag observer 20210606.6079 <140c (Yutaka Maeda) 20210607.5844 <146c (Yutaka Maeda) 20210609.5972 <142c (Yutaka Maeda) 20210609.6164 <168C (Masayuki Moriyama) 20210619.6081 144:c (Yutaka Maeda) 20210620.6425 145:cG (Yutaka Maeda)