About the same time as the Antarctic continents' climate was beginning to change from a hot, greenhouse to the frozen land we know now, between 40 & 50 million years ago, A massive star exploded in what we know as the 'Cocoon Galaxy, NGC 4490.
In early March the light finally reached us and is now designated Supernova 2008ax.
I became aware of this after seeing Greek Astronomy's image on UKAi. A few days later, I was starhopping on my way to NGC4565 and noticed, on my planetarium software, that I was pretty close to the Cocoon and decided to take a quick shot.
The initial results were OK so I changed target and started imaging the Cocoon (looks more like a king prawn to me!)

I eventually ended up with 13 hrs 22 minutes worth of subs taken over a couple of weeks of which I used 10 hours 22 minutes worth.
This breaks down as...

Luminance-43 x 6 minutes
Red 16 x 6 minutes binned 2x2
Green 15 x 6 minutes binned 2x2
Blue 18 x 6 minutes binned 2x2
Ha 7 x 10 minutes binned 2x2

Ha data was blended with the red channel at 50% opacity by converting the monochrome red channel to RGB and adding the Ha data as a luminance layer, then flattening the layers and converting back to greyscale.