ASASSN-17cp long and bright outburst Superoutburst? YYYYMMDD(UT) mag observer 20201021.1656 15.622zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20201023.1301 14.726zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20201023.4240 149cG (Yutaka Maeda) 20201024.4207 149cG (Yutaka Maeda)