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We present medium-resolution spectroscopy and multicolor photometry for theoptical transient PSN J09093496+3307204 (SN 2015bh) in the galaxy NGC 2770,which has transferred into the supernova phase. The observations were carriedout between February 2015 to May 2016. Both at the phase of the SN impostor(2015a) and at the supernova phase (2015b), besides Balmer emissions, thestrong Fe II emissions are seen in the spectrum; so, these spectra resemblethose of Williams Fe II type classical novae. The star is located near the edgeof a dark nebula and notably absorbed (Av = 1.14 +/-0.15 mag). Taking intoaccount this absorption, we determined maximum absolute magnitudes of Mv =-15.0 +/-0.3 mag at the 2015a phase and of Mv = -18.14 +/-0.30 mag at the 2015bphase. The light curve at the 2015b phase is similar to those of SN IIL. Thesupernova progenitor is a luminous blue variable (LBV) star with the powerfulH{\alpha} emission. We considered several hypotheses of supernovae explosionsfollowing optical transients related with LBV. The hypothesis of core collapseof an evolved massive star interrupting the process of its merging with massivecompanion in a binary system (a failed luminous red nova) was chosen as thepreferable one for this event.

Photometry and spectroscopy of SN 2015bh in the galaxy NGC 2770