We study the chemical abundances of the interstellar medium surrounding high-z gamma-ray bursts (GRBs) through analysis of the damped Lyα systems (DLAs) identified in afterglow spectra. These GRB DLAs are characterized by large H I column densities …
We investigate properties of the interstellar medium (ISM) in galaxies hosting long-duration γ-ray bursts (GRBs) from an analysis of atomic species (Mg$^0$, Fe$^0$) and excited fine-structure levels of ions (e.g., Si$^+$). Our analysis is guided …