Possible Supernova PSN J14121396+1550315 in NGC 5504 Narrowfield L -April 4, 2013

Possible Supernova PSN J14121396+1550315 in NGC 5504 Narrowfield L - April 4, 2013, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen west of the nucleus at Mag 18.1 IR.
DISCOVERY
Catalina Real-Time Transient Survey and Stan Howerton: 2013.4.3.420; Mag 18.4
TECHNICAL INFORMATION
Total exposure 75 min (5 x 15 min, luminance filter; binned 2x2, scale 1.01 asec/px)
Time: 2013.4.4.317
Astrometry: RA 14 12 14.05 Dec +15 50 30.9
Photometry: 18.08 +/- 0.13 L (V for ref)

FITS file available on request from jbrimaco@bigpond.net.au