GQ CVn superoutburst YYYYMMDD(UT) mag observer 20210425.2632 17.402zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210426.6187 148:c (Yutaka Maeda) 20210501.2641 15.127zg (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210501.6500 147:cG (Yutaka Maeda) 20210502.6155 152:cG (Yutaka Maeda) 20210503.6385 153c (Yutaka Maeda)