The dust extinction curves of gamma-ray burst host galaxies P. Schady, T. Dwelly, M. J. Page, T. Krühler, J. Greiner, S. R. Oates, M. De Pasquale, M. Nardini, P. W. A. Roming, A. Rossi and M. Still A&A, 537 (2012) A15 Published online: 20 December 2011 DOI: 10.1051/0004-6361/201117414