Possible Supernova PSN J07462695+4819466 in UGC 4007 Narrowfield L - May 21

Possible Supernova PSN J07462695+4819466 in UGC 4007 Narrowfield L - May 21, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen east-south-east of the nucleus at mag 18.3 L
TECHNICAL INFORMATION
Total exposure 30 min (3 x 10 min, luminance filter; binned 2x2, scale 0.91 asec/px)
Time: 2012.5.21.163
Astrometry: RA 07 46 26.86 Dec 48 19 51.2 (discovery end figures 26.95, 46.6 - 4.6 asec difference for dec!)
Photometry: 18.3 +/- 0.1 L
These data were collected remotely using a 51-cm
RCOS and STL11K camera at New Mexico Skies, Mayhill, New
Mexico by Joseph Brimacombe, Coral Towers Observatory,
Cairns, Australia.