Evidence of polarisation in the prompt gamma-ray emission from GRB 930131 and GRB 960924 D. R. Willis, E. J. Barlow, A. J. Bird, D. J. Clark, A. J. Dean, M. L. McConnell, L. Moran, S. E. Shaw and V. Sguera A&A, 439 1 (2005) 245-253 Published online: 22 July 2005 DOI: 10.1051/0004-6361:20052693