Abstract Spectroscopic constants and potential energy curves of several low-lying electronic states of the GeBr radical are computed using the complete active space multiconfiguration self-consistent filed (CASSCF) followed by first- and second-order configuration interaction (FOCI, SOCI) methods which included up to a million configurations. Our computed spectroscopic constants confirm the assignments of X , A , A ′, B , and C states. Spectroscopic properties of several other electronic states below 30 000 cm −1 are predicted, which are yet to be observed.