M51 1

I think you have captured the supernova, well done :)

It is the middle one of those three bright-ish stars that go left to right and begin just "upwards" from the core. Go straight up from the core, at the first bright star go right and that bright star is the SN.

Wow I have, my first ever DSO and I captured a supernova, thats got to be very lucky :) Thanks.