The optical/NIR afterglow of GRB 111209A: Complex yet not unprecedented D. A. Kann, P. Schady, E. F. Olivares, S. Klose, A. Rossi, D. A. Perley, B. Zhang, T. Krühler, J. Greiner, A. Nicuesa Guelbenzu et al. (17 more) A&A, 617 (2018) A122 Published online: 01 October 2018 DOI: 10.1051/0004-6361/201731292