Supernova to the left of the nucleus?

http://legacysurvey.org/viewer?ra=27.1088&dec=-1.0348&zoom=16&layer=decals-dr3

SDSS image

Most likely starburst, I guess.

In the SDSS images supernovae often have a blue colour. What kind of colour do they have on DECaLS images?

SDSS images are made from g,r,i bands. DECaLS from g,r,z, so colors are often similar. Depends on the stretch too…

cheers,
–dustin