The Density and Ionization Profile of Optically Dark and High Redshift GRBs Probed by X-ray Absorption

Eka Puspita Arumaningtyas, Hasan Al Rasyid, Maria Giovanna Dainotti +1

The X-ray column density (NHX) of gamma-ray bursts (GRBs) can probe the local environment of their progenitors over a wide redshift range. Previous work has suggested an increasing…