POSSIBLE SUPERNOVA IN NGC 7753
Zhijian Xu(Nanjing,Jiangsu,China) and Xing Gao (Urumqi,Xinjiang,China), report the discovery of a possible supernova (mag approximately 17.5) on a 40-s survey image (limiting mag about 18.0) taken by Xing Gao in Xingming Observation Sky Survey(C42) around Jan.25.58041 UT.using an unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=23h 47m 07s.87 Decl.=+29°29’11”.5(equinox 2000.0). Which is about 34.3″ east and 11.3″ north of the center of the NGC 7753. Nothing is visible at this position on archival images taken on Jan.19(limiting mag 18.0),Jan.20(limiting mag 17.8),Dec.09,2012(limiting mag 19.0) or on the DSS from Oct.01,1991(limiting mag about 19.5).
XM57ZX C2013 01 25.58041 23 47 07.87 +29 29 11.5 17.5 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM57ZX/XM57ZX.htm
C42,Xingming Observatory,Mt. Nanshan. Observers Z.Xu,X.Gao,Measurers Z.Xu 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.
Discovery image taken by C42 on Jan.25.58041 UT,2013（90S*4）
archival image taken on 2013.Jan.20& Jan.19