Hanjie Tan, Guoyou Sun, Mi Zhang, Xing Gao (Xingming Observatory), report ~3.6 mag outburst in a variable star candidate ( 17.85 r ) which is 21.40 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. 22.66360 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm22ht.html
XM22HT C2020 12 22.66360 05 40 09.29 +50 40 11.3 17.85 r N88
