Hanjie Tan (Institute of Astronomy, National Central University), Mi Zhang, Guoyou Sun, Jingyuan Zhao (Xingming Observatory), Quanzhi Ye , Xing Gao (Xingming Observatory), report >2 mag outburst in a variable star candidate (17.12 r). The transient was discovered on several 120-s survey images (limiting mag about 18.0) taken by Xing Gao at Xingming Observatory #3 (N88) around Apr. 20.90194, 2021 UT using a unfiltered CCD (0.3-m f/3.6 reflector). Images can be found at: http://xjltp.china-vo.org/xm67ht.html
XM67HT C2021 04 20.90194 18 54 35.43 +19 09 49.8 17.12 r N88
