Zhangwei Jin(Ningbo, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China), report the discovery of a possible supernova (mag approximately 16.6) on a 60-s survey image (limiting mag about 19.5)taken by Xing Gao in Xingming ObservationSky Survey(C42) around May. 13.84400 UT,2011. using a unfilled CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=350-mm @f/6.9 ).the new object approximately located at R.A. =14h 00m 46s.32 Decl.=+48<26'46".4 (equinox 2000.0). Which is about 15.6" west and 8.4" north of the center of the NGC 5425.
Nothing is visible at this position on archival images taken on Apr. 24 (limiting mag 19.0) , Apr. 27 (limiting mag 17.5) and May. 27 (limiting mag 17.5) or on the DSS(POSS2/UKSTU Red) from Mar 26,1989(limiting mag about 19.5).

XM21ZJ C2011 05 13.84400 14 00 46.32 +48 26 46.4 16.6 R C42
All images can be seen from: http://www.xjltp.com/XOSS/XM21ZJ/XM21ZJ.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. 13.84400 UT,2011LM=19.5,60S