Calculating the Electromagnetic Signal of Massive Binary Black Holes

Supermassive black hole binary (SMBHB) systems are potential sources of electromagnetic (EM) radiation, with the EM signatures influenced by gas dynamics, orbital dynamics, and radiation processes. The gas dynamics are governed by general relativistic magnetohydrodynamics (GRMHD) in a time-dependent spacetime. Using a general relativistic ray tracing code we post-process numerical relativity simulations of these binary systems. We will present progress in calculating the electromagnetic signals of inspiraling and merging supermassive binary black hole binary systems.