The Unprecedented Properties of the First Electromagnetic Counterpart to a Gravitational-wave Source

M. R. Siebert, R. J. Foley, M. R. Drout, C. D. Kilpatrick, B. J. Shappee, D. A. Coulter, D. Kasen, B. F. Madore, A. Murguia-Berthier, Y. -C. Pan, A. L. Piro, J. X. Prochaska, E. Ramirez-Ruiz, A. Rest, C. Contreras, N. Morrell, C. Rojas-Bravo, J. D. Simon