NN Cam superoutburst (Not a rare event) YYYYMMDD(UT) mag observer 20200731.4462 17.976zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20200815.3854 14.136zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20200815.7515 135C (Masayuki Moriyama) 20200815.8214 130cG (Yutaka Maeda)