SN 1997D, discovered on January 1997 in galaxy NGC 1536 in Dorado constellation 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 neutron star was formed during the collapse of the star, it is likely that star was in upper spectrum of the mass.

Remnants

Observations of the light curve from SN 19997D showed no evidence of other energy sources in the expending supernova envelope therefor it is unlikely that Neutron star was created, all the evidence leads to the creation of the stellar mass black hole of approximately 3 solar masses.