Rainer Ehlert has pointed out on the RSpec forum that there is a Mag 12 star GSC 00288 00235 listed at the same position (with an arcsec) but this does not appear in images from DSS,SDSS PanSTARRS and there is certainly nothing that bright there now. (SN2021hiz is definitely a type Ia SN at a redshift matching UGC 7513)
Could there be an error in the GSC catalogue and the exact coordinate match a coincidence or is there more to this ? Any ideas ?
Cheers
Robin