All Figures

$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm,clip]{nh.ps} \end{figure}$ Figure 1: Galactic column density versus column density obtained from spectral fit of the X-ray afterglow. Open circles are values obtained without any redshift information. Filled circles indicate values for the six GRBs with known redshift at the redshift of the host galaxy. Upper limits are also indicated with filled and open circles, as above. The line represents the prints of equal values between the Galactic and the total column density (i.e. no intrinsic absorption).
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm,clip]{histo.ps}\end{figure}$ Figure 2: Distribution (solid histogram) of intrinsic column density in a sample of 18 GRBs observed by Swift and other satellites (Stratta et al. 2004; De Luca et al. 2005). This is compared with the expected distribution of column density for GRB that occur in Galactic-like molecular clouds (dashed histogram, from Reichart & Price 2002).
Open with DEXTER

In the text

$\begin{figure} \par\includegraphics[angle=-90,width=7.5cm,clip]{histo.ps}\end{figure}$	Figure 2: Distribution (solid histogram) of intrinsic column density in a sample of 18 GRBs observed by Swift and other satellites (Stratta et al. 2004; De Luca et al. 2005). This is compared with the expected distribution of column density for GRB that occur in Galactic-like molecular clouds (dashed histogram, from Reichart & Price 2002).
Open with DEXTER