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Observations were made within 600 days of the outburst using the Liverpool Telescope (LT) and the Northern Optical Telescope (NOT). SN 2020nlb decreased in brightness faster than average supernovae of this type. The spectrum of SN 2020nlb, obtained almost three days after the start of the explosion, shows clear features indicating the presence of singly ionized metals.
The spectra of SN 2020nlb, which has entered the nebular phase, compared to the nebular spectra of other SNe Ia indicate a possible trend in which supernovae that have high brightness at peak have higher ionization. This may imply that SN 2020nlb and similar supernovae have features that distinguish them from the bulk of other supernovae of this type.
