As presented by NASA at http://apod.nasa.gov/apod/astropix.html, I was taking some test images on Wednesday, June 1, and captured the Supernova in M51, as I discovered after being notified of the event from friends. Here is an upprocessed raw CCD image of it. Reference Observing session 4/29/2011 for before/after comparison.
StarHopper.org 