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Fig. 8.


C Iλ 1560 rest-frame equivalent width as a function of dust extinction, AV (left panel) and 2175 Å bump strength, Abump (right panel). The blue filled circles denote the GRBs with C I detected in absorption (empty blue circles show the GRBs with C I detected below the completeness limit), where the filled blue left-pointing triangles in the right panel represent the upper limit on Abump derived for the other GRB C I absorbers (assuming an SMC bar extinction curve). The yellow squares show the quasar C I absorbers from Ledoux et al. (2015) and the green diamond symbols represent the quasar 2175 Å dust extinction feature absorbers from Ma et al. (2018). The dashed lines mark the Wr(λ 1560) detection limit and maximum AV and Abump for the GRBs with non-detections of C I.

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