Another candidate:
http://www.aavso.org/publications/alerts/alert381.shtml
Event: Second (Possible) Nova in Ophiuchus in 2008 - N OPH 2008 NO. 2
Discovered By: K. Nishiyama, Kurume, Fukuoka-ken, Japan, and F. Kabashima,
Miyaki-cho, Saga-ken, Japan
Discovery Date: May 31.608 and 31.609 UT
Discovery Magnitude: unfiltered CCD magnitude 11.3 (two 30-s CCD frames using
a 105-mm f/5.6 camera lens)
Position: R.A. = 17:33:29.67 Decl. = -27:01:16.4 (equinox 2000.0)
measured by Nishiyama and Kabashima on their confirming image taken
May 31.628 UT.
SJS