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We report the discovery and multicolor V,R,I,W photometry of a rare explosive star MASTER OT J004207.99+405501.1 - a luminous red nova - in the Andromeda galaxy (M31N2015-01a). We use our original light curve acquired with identical MASTER Global Robotic Net telescopes to estimate the mass and energy of the ejected shell, and discuss the likely formation scenarios of outbursts of this type’s object