ET Sge outburst Relatively rare outburst. YYYYMMDD(UT) mag observer 20220218.5597 17.177zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220219.5537 16.604zr (Zwicky Transient Facility Lasair (Masci+ 2019)) 20220219.5562 16.607zr (Zwicky Transient Facility Lasair (Masci+ 2019))