My picture was compared with pictures on the TNS (Transient Name Server of the IAU) - see this link and astronometry.
In order to get the best view of the potential supernova I inverted colors, but on both the inverted picture as the colored picture the nova can be seen.
Above my inverted picture (Nikon D7500 TAL200K f/8.5 ISO12800 18m) indicating the potential supernova AT2019abn (AT = Astronomical Transient) by the black cross in the "arms" of M51.
