  We describe new results on two supernova impostors in NGC 2403, SN 1954J(V12)
and SN 2002kg(V37). For the famous object SN 1954J we combine four critical
observations: its current SED, its Halpha emission line profile, the Ca II
triplet in absorption in its red spectrum, and the brightness compared to its
pre-event state. Together these strongly suggest that the survivor is now a hot
supergiant with T ~ 20000 K, a dense wind, substantial circumstellar
extinction, and a G-type supergiant companion. The hot star progenitor of V12's
giant eruption was likely in the post-red supergiant stage and had already shed
a lot of mass. V37 is a classical LBV/S Dor variable. Our photometry and
spectra observed during and after its eruption show that its outburst was an
apparent transit on the HR Diagram due to enhanced mass loss and the formation
of a cooler, dense wind. V37 is an evolved hot supergiant at ~10^6 Lsun with a
probable initial mass of 60 -80 Msun.
