Possible Supernova PSN J15213475-0722183 in NGC 5917 Narrowfield L - Jan 5, 2013

Possible Supernova PSN J15213475-0722183 in NGC 5917 Narrowfield L - Jan 5, 2013, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen east-north-east of the nucleus at Mag 19.3 L. Low quality data - short exposure at dawn.
DISCOVERY
Unknown: 2013.1.27.340; Mag 17.6
TECHNICAL INFORMATION
Total exposure 15 min (3 x 5 min, luminance filter; binned 2x2, scale 0.91 asec/px)
Time: 2013.2.5.540
Astrometry: RA 15 21 34.72 Dec -07 22 18.3
Photometry: 19.3 +/- 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.