Upper panel: optical spectra of WISE J101544.43+555100.6, potential counterpart of 2FGL J1016.1+5600, classified as a QSO at z = 0.677 on the basis of the emission lines marked in the plot. The average S/N is also indicated. Middle panel: normalized spectrum. Lower panel: 5′ × 5′ finding chart from the Digital Sky Survey (red filter). The potential counterpart of 2FGL J1016.1+5600 is indicated by the red circle.