Possible Supernova PSN J16234592+0947123 in PGC 58009 Narrowfield L - July 18

Possible Supernova PSN J16234592+0947123 in PGC 58009 Narrowfield L - July 18, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen east-south-east of the nucleus at Mag 17.1 L
DISCOVERY
Unknown: 2012.7.16.970; Mag 17.4
TECHNICAL INFORMATION
Total exposure 60 min (4 x 15 min, luminance filter; binned 2x2, scale 0.91 asec/px)
Time: 2012.7.18.263
Astrometry: RA 16 23 45.90 Dec 09 47 12.9
Photometry: 17.1 +/- 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.