MASTER OT J152804.66-673720.4 outburst http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia20chx/ Gaia20chx AT2019xjk 2020-05-17 18:45:48 232.01989 -67.62213 15.84 19.34 0.58 CV 2020-05-18 10:05:14 ~4 mag outburst in Gaia source, candidate Dwarf nova