New constraints on the physical conditions in H${}_2$-bearing GRB-host damped Lyman-$\alpha$ absorbers

K. E. Heintz, J. Bolmer, C. Ledoux +25

We report the detections of molecular hydrogen (H${}_2$), vibrationally-excited H${}_2$ (H${}_2^{\ast }$), and neutral atomic carbon (CI), in two new afterglow spectra of GRBs\,181020A ($z=2.9…