Possible Supernova CSS130603:132320+101126 in an Anonymous Galaxy Narrowfield L - June 5

Possible Supernova CSS130603:132320+101126 in an Anonymous Galaxy Narrowfield L - June 5, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen at Mag 19.2 L. Measurements include light from faint anonymous host seen on DSS2 image
DISCOVERY
Catalina Real-Time Transient Survey: 2013.6.3; Mag 19.26
TECHNICAL INFORMATION
Total exposure 75 min (5 x 15 min, luminance filter; binned 2x2, scale 0.91 asec/px)
Time: 2013.6.5.231
Photometry: Mag 19.17 +/- 0.15 L (V for ref)
Astrometry: RA 13 23 19.91 Dec +10 11 24.5
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.
FITS file available on request from jbrimaco@bigpond.net.au