Colour variations in the GRB 120327A afterglow A. Melandri, S. Covino, E. Zaninoni, S. Campana, J. Bolmer, B. E. Cobb, J. Gorosabel, J.-W. Kim, P. Kuin, D. Kuroda et al. (35 more) A&A, 607 (2017) A29 Published online: 31 October 2017 DOI: 10.1051/0004-6361/201731759