Gaia19bhc 15.26-mag blue transient (dwarf nova?) Gaia19bhc AT2019ddt 2019-04-07 15:17:19 347.68061 47.16521 15.26 unknown 2019-04-12 11:34:23 blue hostless transient http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19bhc/