Possible Supernova PSN J11095567+3657025 in NGC 3542 Narrowfield L - May 16, 2013

Possible Supernova PSN J11095567+3657025 in NGC 3542 Narrowfield L - May 16, 2013, a photo by Joseph Brimacombe on Flickr.

Via Flickr:
SUMMARY
SN seen north-north-east of the nucleus at Mag 18.3 L.
DISCOVERY
Ron Arbour: 2013.5.15.982190; Mag 17.4
TECHNICAL INFORMATION
Total exposure 105 min (7 x 15 min, luminance filter; binned 2x2, scale 0.91 asec/px)
Time: 2013.5.16.280
Astrometry: RA 11 09 55.71 Dec +36 57 02.6
Photometry: 18.28 +/- 0.04 L (V for ref)
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