Evidence for dust destruction from the early-time colour change of GRB 120119A

Adam N. Morgan, Daniel A. Perley, S. Bradley Cenko, Joshua S. Bloom, Antonino Cucchiara, Joseph W. Richards, Alexei V. Filippenko, Joshua B. Haislip, Aaron LaCluyze, Alessandra Corsi, Andrea Melandri, Bethany E. Cobb, Andreja Gomboc, Assaf Horesh, John Berian James, Weidong Li, Carole G. Mundell, Daniel E. Reichart, Iain Steele