SN 2021adlw: Supernova or LBV Outburst?

We present low‐resolution optical spectroscopic and photometric observations of SN 2021adlw. The photometric monitoring in filters continued for 122 days and 2 spectra were collected. The early spectrum allowed to classify the transient as SN IIn, but later it was supposed that it was an outburst of LBV. The spectra and color curves of SN 2021adlw reveal high extinction in the host galaxy, for which we give an estimate mag. The spectra before maximum show lines of HI with narrow peaks and wide wings, with FWHM about 350 and 3000 km·s −1 , respectively. SN 2021adlw displays typical for most of SNe IIn photometric evolution: long rise to the maximum and slow, nearly linear brightness decline. The peak absolute magnitude is . We propose SN 2021adlw is a low‐luminosity type IIn supernova.