Zhangwei Jin(Ningbo, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China), report the discovery of a possible supernova (mag 18.1 at discovery, mag 17.4 in confirmation images) on two 40-s survey images (limiting mag about 19.5)taken by Xing Gao in Xingming ObservationSky Survey(C42) around May. 09.87944 and 10.66116 UT, 2013. using an unfilted CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=350-mm @f/6.9 ).the new object approximately located at R.A. =17h 04m 52s.95 Decl.=+12กใ55'10".4(equinox 2000.0). Which is about 22.0" east and 18.6" south of the center of the PGC 059557.
Nothing is visible at this position on archival images taken on May.04,2013. (limiting mag 19.5) nor on the DSS(POSS2/UKSTU Red) from Apr. 06,1989(limiting mag about 19.8)
XM45ZJ C2013 05 09.87944 17 04 52.95 +12 55 10.4 18.1 V C42
XM45ZJ C2013 05 10.66116 17 04 52.89 +12 55 10.4 17.4 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM45ZJ/XM45ZJ.htm

C42,Xingming Observatory, Mt. Nanshan. Observers Z.Jin, X.Gao ,Measurers Z.Jin 0.35-m f/6.9 Schmidt-Cassegrain telescope and CCD.



Discovery image taken by C42 on May.09.87944 UT,2013(LM=19.5,40S) & May.10.66116


Archival image taken on 2013.May.04