X-ray absorbing column densities of a complete sample of short gamma ray bursts L. Asquini, S. Campana, P. D’Avanzo, M. G. Bernardini, S. Covino, G. Ghirlanda, G. Ghisellini, A. Melandri, L. Nava, O. S. Salafia et al. (4 more) A&A, 625 (2019) A6 Published online: 30 April 2019 DOI: 10.1051/0004-6361/201832998