Example light curves for constant χ_BH – varying M_BH (left columns) and constant M_BH – varying χ_BH (right columns). Panels a and b: KN r-band (657 nm, filled lines) and K-band (2143 nm, dashed lines) light curves. Panels c–h: GRB afterglow optical (panels c and d), X-ray (panels e and f), and radio (panels g and h) light curves for three viewing angles (0° dot-dashed lines, 30° filled lines, and 60° dashed lines). The KNR (dotted lines) is also shown in panels g and h.