Table 3: Results of the spectral analysis of GRB with known redshift.
GRB  Redshift $N_{\rm H}$ Gal. $N_{\rm H}$ obs.* $\chi^2_{\rm red}$ $N_{\rm H}$DLA ($90\%$)
  (ref.) $10^{20}\rm\ cm^{-2}$ $10^{20}\rm\ cm^{-2}$ (d.o.f.) $10^{20}\rm\ cm^{-2}$
050126 1.29 (1) 5.3 <9.4 1.0 (10) 0.8 (6.4)
050315 1.95 (2) 4.3 $\rm 83.7^{+19.7}_{-17.4}$ 1.4 (43) 1.4 (5.7)
050318 1.44 (3) 2.8 $\rm 11.3^{+10.7}_{-8.9}$ 0.6 (39) 0.9 (12.9)
050319 3.24 (4) 1.1 $\rm 38.6^{+18.0}_{-16.0}$ 1.4 (29) 3.6 (447)
050401 2.90 (5) 4.8 $\rm 366^{+47}_{-46}$ 1.1 (294) 3.0 (272)
050408 1.24 (6) 1.7 $\rm 134^{+34}_{-28}$ 1.0 (45) 0.8 (4.7)
980703 0.97 5.8 $\rm 290^{+71}_{-27}$   0.6 (1.7)
990123 1.60 2.1 $\rm 30^{+70}_{-20}$   1.1 (23.1)
990510 1.63 9.4 $\rm 160^{+19}_{-13}$   1.1(25.1)
000210 0.85 2.5 $\rm 50^{+10}_{-10}$   0.0 (0.0)
000214 0.47 5.8 <2.7   0.0 (0.0)
000926 2.07 2.7 $\rm 40^{+35}_{-25 }$   1.6 (73.9)
010222 1.48 1.6 $\rm 120^{+70}_{-60 }$   1.0 (15.1)
001025a 1.48 6.1 $\rm 66^{+30}_{-30}$   1.0 (15.1)
020322 1.80 4.6 $\rm 130^{+20}_{-20}$   1.3 (40.7)
020405 0.70 4.3 $\rm 47^{+37}_{-37}$   0.0 (0.0)
020813 1.25 7.5 <36.5   0.8 (5.0)
021004 2.33 4.3 <34   2.0 (118)
030226 1.98 1.6 $\rm 68^{+41}_{-33}$   1.5 (60.8)
030227 3.90 22 $\rm 680^{+18}_{-38}$   5.2 (649)
030328 1.52 4.3 <44.3   1.0 (17.3)
* Column density values have been computed at the GRB redshift.
References: (1) Berger et al. (2005a); (2) Kelson & Berger (2005); (3) Berger & Mulchaey (2005); (4) Fynbo et al. (2005a); (5) Fynbo et al. (2005b); (6) Berger et al. (2005b). Values in the second part of the table are from Stratta et al. (2004), De Luca et al. (2005) and Gendre et al. (2005).

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