Hanjie Tan, Guoyou Sun, Mi Zhang, Xing Gao (Xingming Observatory), report ~3.5 mag outburst in a variable star candidate ( 16.22 r ) which is 19.72 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 Dec. 23.56440 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm23ht.html
XM23HT C2020 12 23.56440 21 26 54.18 +47 43 27.3 16.22 r N88
