Suspect Supernovae.

Alessandro Dimai , Cortina d'Ampezzo, Italy reports that in NGC 4303 (M 61) is present a suspect object shown in the image below

He took only this image with a CCD camera coupled to a Mt.0.50 telescope on Dec 17 at 5:15 U.T.
No other images he took because of sunrise

This is the result of minor planet checker

The following minor planets, brighter than V = 18.0, were found in the 30-arcminute region around NGC 4303 (R.A. = 12 21.9, Decl. = +04 28, J2000.0) on 1999 12 17.25 UT:

 Object designation           R.A.     Decl.    V       Offsets     Motion/hr   Orbit  Further observations?
                              h  m      °  '          R.A.   Decl.  R.A.  Decl.        Comment.  (Elong./Decl/V at date 1)

 (5180) Ohno                12 20.76 +04 26.0  17.6  17.0W   2.0S   0.8+   0.2-    4o  Desirable between 1999 Dec. 17-2000 Jan. 16.  ( 81.8,+04.5,17.6)

Please, take a look !