Now classified as a Ia but the classifiers suggest it could be a subluminous supernova around/post maximum light rather than caught early.
https://wis-tns.weizmann.ac.il/object/2020nlb
It seems odd in that case though that it was not visible to ATLAS 2 days previously
https://wis-tns.weizmann.ac.il/astronotes/astronote/2020-126
(hopefully link not mangled this time !)