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We present CCD photometry and low-resolution spectra of the eclipsing binary GR Boo. A new ephemeris is determined based on all the available times of the minimum light. The period analysis reveals that the orbital period is decreasing with a rate of dP/dt=−2.05×10−10dyr−1. A photometric analysis for the obtained light curves is performed with the Wilson–Devinney Differential Correction program for...