MGAB-V300 outburst Possible SU UMa star (based on the ZTF data). YYYYMMDD(UT) mag observer 20210217.5584 14.964zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20210217.5608 14.956zr (Zwicky Transient Facility Lasair (Masci+ 2019))