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Is this an explosion on the upper left of the galaxy, or just a bright star within it?
Hi,
Welcome 
It may just be a bright star. If you click on the map, in the popup there is a “Single Exposures” link -
The exposures are listed by filter (band), so scroll down to z band (red, in these images), the last three images. You can see those were taken about a month apart, and the dot looks about equally bright in each. I think that would suggest it’s not a supernova.
It’s detected in Gaia, but doesn’t have a proper motion – that’s another way of identifying foreground stars.
cheers,
dustin
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