I'm not certain, but there is a candidate transient near M51. http://www.cbat.eps.harvard.edu/unconf/followups/J13303600+4706330.html There is an XMM source 133035.5 +470631 (2000.0) 2XMM_J133035.5+470631 err=1.7 4.510e-15 0.36 -0.03 -0.46 0.62 Does anyone have more information?