Hanjie Tan, Guoyou Sun, Mi Zhang, Jingyuan Zhao, Xing Gao (Xingming Observatory), report the outburst in a variable star 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 19.0) taken by Xing Gao at Xingming Observatory #3 (N88) around Feb. 28.93343, 2021 UT using a unfiltered CCD (0.3-m f/3.6 reflector). Images can be found at: http://xjltp.china-vo.org/xm55ht.html
XM55HT C2021 02 28.93343 20 07 59.98 +47 34 22.7 16.93 r N88
