Аннотация:MASTER OT J033744.97+723159.0 (SN 2017gpn) was discovered in the error box of LIGO/Virgo alert G299232. The spectrum of SN 2017gpn is consistent with a Type IIb supernova. In this work we present the photometry of 20 epochs of observations performed with CCD photometer on the Zeiss-1000 telescope. The light curves in B and R filters were obtained. The multicolor light curves were also modeled numerically using the one-dimensional radiation hydrodynamical code STELLA.