Table 3: A list of all Swift GRBs with z > 2 known to date (1 October 2006). N(H I) is derived from optical spectroscopy. References are given in order for the redshift and the H I column density (information is not currently available for bursts marked with -). (1) This work; (2) Watson et al. (2006a); (3) Berger et al. (2006b); (4) Berger et al. (2005); (5) Starling et al. (2005); (6) Ledoux et al. (2005); (7) Ledoux et al. (in prep); (8) Kawai et al. (2006); (9) Foley et al. (2005); (10) Quimby et al. (2005); (11) Piranomonte et al. (2006); (12) Prochaska et al. (2006b); (13) J. X. Prochaska (private communication); (14) Fynbo et al. (2006b); (15) Cucchiara et al. (2006a); (16) Cucchiara et al. (2006b); (17) Berger et al. (2006a); (18) Price (2006); (19) Cenko et al. (2006a); (20) Ferrero et al. (2006); (21) Ledoux et al. (2006); (22) Smette et al. (in prep); (23) Rol et al. (2006); (24) D'Elia et al. (2006); (25) Fugazza et al. (in prep); (26) Fynbo et al. (2006a).
GRB  z $\log N(H {\sc i})$ References
050319 3.24 $20.9 \pm 0.2$ (1) (1)
050401 2.90 $22.6 \pm 0.3$ (2) (2)
050505 4.27 $22.1 \pm 0.1$ (3) (3)
050603 2.82 - (4)
050730 3.97 $22.1 \pm 0.1$ (5) (5)
050820A 2.61 $21.1 \pm 0.1$ (6) (7)
050904 6.30 21.3 (8) (8)
050908 3.34 19.2 (9) (9)
050922C 2.20 $21.6 \pm 0.1$ (1) (1)
051109 2.35 - (10)
060115 3.53 - (11)
060124 2.30 <20.3 (12) (13)
060206 4.05 $20.9 \pm 0.1$ (14) (14)
060210 3.91 $21.7 \pm 0.2$ (15) (16)
060223 4.41 - (17)
060510B 4.94 - (18)
060522 5.11 $20.5 \pm 0.5$ (19) (19)
060526 3.22 $20.0 \pm 0.2$ (1) (1)
060605 3.71 - (20)
060607 3.08 <19.5 (21) (22)
060707 3.43 $21.0 \pm 0.2$ (1) (1)
060714 2.71 $21.8 \pm 0.1$ (1) (1)
060906 3.69 $21.9 \pm 0.1$ (1) (1)
060908 2.43 - (23)
060926 3.21 $22.7 \pm 0.1$ (24) (25)
060927 5.6 - (26)


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