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We present the results of our UBVRI CCD photometry for the second brightestsupernova of 2009, SN 2009nr, discovered during a sky survey with thetelescopes of the MASTER robotic network. Its light and color curves andbolometric light curves have been constructed. The light-curve parameters andthe maximum luminosity have been determined. SN 2009nr is shown to be similarin light-curve shape and maximum luminosity to SN 1991T, which is the prototypeof the class of supernovae Ia with an enhanced luminosity. SN 2009nr explodedfar from the center of the spiral galaxy UGC 8255 and most likely belongs toits old halo population. We hypothesize that this explosion is a consequence ofthe merger of white dwarfs.

Photometric observations of the supernova 2009nr