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HI column densities of z > 2 Swift gamma-ray bursts

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GRB 050505 : a high-redshift burst discovered by Swift

E. Rol, J. P. Osborne, K. L. Page, 2006, astro-ph/0602236.

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Melvyn B. Davies, Andrew J. Levan, Nial R. Tanvir, 2006 .

An origin in the local Universe for some short γ-ray bursts

R. S. Priddey, A. J. Levan, N. R. Tanvir, 2005, Nature.

A photometric redshift of z = 6.39 ± 0.12 for GRB 050904

M. Moles, E. Rol, D. Bersier, 2006, Nature.