Hanjie Tan and Xing Gao, report ~4.8 mag outburst in a known variable star ( 14.27 r ) which is 19.08 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 Sep. 02.68355 UT using a unfiltered CCD ( 0.3-m f/3.6 reflector ). Images can be found at: http://xjltp.china-vo.org/xm13ht.html
XM13HT C2020 12 02.68355 22 57 44.22 +61 29 33.1 14.27 r N88
*Known VS NSVS J2257440+612933
