Hanjie Tan, Guoyou Sun, Mi Zhang, Xing Gao (Xingming Observatory), report ~0.5 mag outburst in a known variable star ( 17.77 r ) which is 18.22 rmag in Pan-STARRS DR1 catalogue. 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 Jan. 16.77579, 2021 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm39ht.html
XM39HT C2021 01 16.77579 05 54 03.17 +20 06 57.4 17.77 r N88
*Known VS MGAB-V259
