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We present full photometric coverage and spectroscopic data for soft GRB201015A with a redshift z = 0.426. Our data spans a time range of 85 daysfollowing the detection of GRB. These observations revealed an underlyingsupernova SN 201015A with a maximum at $8.54 \pm $1.48 days (rest frame) and anoptical peak absolute magnitude $-19.45_{-0.47}^{+0.85}$ mag. The supernovastands out clearly, since the contribution of the afterglow at this time is notdominant, which made it possible to determine SN's parameters. A comparison ofthese parameters reveals that the SN 201015A is the earliest (the minimum$T_{max}$) known supernova associated with gamma-ray bursts. Spectroscopicobservations during the supernova decay stage showed broad lines, indicating alarge photospheric velocity, and identified this supernova as a type Ic-BL.Thus, the SN 201015A associated with the GRB 201015A becomes the 27th SN/GRBconfirmed by both photometric and spectroscopic observations. Using the resultsof spectral analysis based on the available data of Fermi-GBM experiment, theparameters $E_\text{p,i} = 20.0 \pm 8.5$ keV and $E_\text{iso} = (1.1 \pm 0.2)\times 10^{50}$ erg were obtained. According to the position of the burst onthe $E_\text{p,i}$-$E_\text{iso}$ correlation, GRB 201015A was classified as aType II (long) gamma-ray burst, which was also confirmed by the$T_\text{90,i}$-$EH$ diagram.

GRB 201015A: from seconds to months of optical monitoring and supernova discovery