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We report the discovery of an eclipsing binary star (KIC 7025851) near KOI565 (KIC 7025846) based on photometric observations of KOI 565 and severalnearby stars acquired in two narrow bandpasses (790.2 and 794.3\pm2.0 nm)nearly-simultaneously with the GTC/OSIRIS. We use the individual photometry ineach bandpass as well as the colors of KOI 565 and other nearby stars todetermine that the source of the transit signal initially detected by Kepler isnot due to a super-Earth-size planet around KOI 565. Instead, we find thesource to be a background eclipsing binary star located \sim15 arcsec to theNorth of KOI 565. We discuss future prospects for using high-precisionmulti-color photometry from the GTC to determine whether additional Keplerplanet candidates have a planetary nature or are instead false positives (e.g.,foreground or background eclipsing binaries or hierarchical triple systems).Our approach is complementary to multi-color follow-up observations of Keplerplanet candidates currently being conducted with the Spitzer space telescope inthe infrared as well as to other follow-up techniques.

Vetting Kepler Planet Candidates with Multi-Color Photometry from the GTC: Identification of an Eclipsing Binary Star Near KOI 565