Hanjie Tan (Institute of Astronomy, National Central University), Mi Zhang, Guoyou Sun, Jingyuan Zhao (Xingming Observatory), Quanzhi Ye , Xing Gao (Xingming Observatory), report the outburst in a supernova candidate (16.93 r). Nothing is visible at this position on Pan-STARRS images. 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. 04.66508, 2021 UT using a unfiltered CCD (0.3-m f/3.6 reflector). Images can be found at: http://xjltp.china-vo.org/xm65ht.html
XM65HT C2021 04 04.66508 05 19 16.66 +44 44 30.8 16.93 r N88
