POSSIBLE NOVA IN M31

Zhangwei Jin(Ningbo, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China),report the discovery of a possible nova (mag approximately 17.9) on several 40-s survey images (limiting mag about 18.5) taken by Xing Gao in Xingming Observatory Sky Survey(C42) around Mar. 02.57039 UT using a unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). the new object approximately located at R.A.=00h42m26.28s +42d13'31".9 (equinox 2000.0). Which is about 203.1" west and 3443.1" north of center of the NGC224(M31).
Prediscovery images taken on Feb. 19.58119 (limiting mag 18.5), Feb. 20.57627 (limiting mag 18.0), Feb. 21.56854 (limiting mag 18.0) and Mar. 01.57823 (limiting mag 18.5). Nothing is visible at this position on archival images taken on Feb 07.59203 (limiting mag 18.5) or Jan 31.56422 (limiting mag 19.0).

NET USNO-A2.0
XM42ZJ C2013 02 19.58119 00 42 26.30 +42 13 32.5 17.3 V C42
XM42ZJ C2013 02 20.57627 00 42 26.39 +42 13 31.8 17.3 V C42
XM42ZJ C2013 02 21.56854 00 42 26.22 +42 13 32.0 17.5 V C42
XM42ZJ C2013 03 01.57823 00 42 26.28 +42 13 31.9 17.7 V C42
XM42ZJ C2013 03 02.57039 00 42 26.31 +42 13 31.6 17.9 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM42ZJ/XM42ZJ.htm
C42 Xingming Observatory, Mt. Nanshan. Observers Z.Jin,X.Gao ,Measurers Z.Jin. 0.356-m f/6.9 Schmidt-Cassegrain telescope and CCD.

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Discovery image taken by C42 on Mar.02.57039 UT,2013(LM=18.5,40S)

Pre-Discovery image taken by C42 on Feb.19.58119 UT,2013(LM=18.5,40S)

GIF