A Decline in the X-Ray through Radio Emission from GW170817 Continues to Support an Off-axis Structured Jet

K. D. Alexander, R. Margutti, P. K. Blanchard, W. Fong, E. Berger, A. Hajela, T. Eftekhari, R. Chornock, P. S. Cowperthwaite, D. Giannios, C. Guidorzi, A. Kathirgamaraju, A. Macfadyen, B. D. Metzger, M. Nicholl, L. Sironi, V. A. Villar, P. K.G. Williams, X. Xie, J. Zrake