SN 1997D was a supernova discovered on 14 January 1997 by Duília de Mello in NGC 1536 in the Reticulum constellation and is a first clearly identified example of atypical Type II supernova with a very low luminosity and expansion velocity.
Progenitor
There are two alternatives, a high-mass 25-40 solar masses star or smaller star with mass of 8-10 solar masses. As there is no evidence that a neutron star was formed during the collapse of the star, it is likely that star was in the upper spectrum of the mass.
Remnants
Observations of the light curve from SN 1997D showed no evidence of other energy sources in the expanding supernova envelope therefore it is unlikely that a neutron star was created. All the evidence leads to the creation of the stellar mass black hole of around 3 solar masses.
