Gamma-ray bursts and their use as cosmic probes.

Additionally, there is some evidence that the most dust-extinguished GRBs have host galaxy extinction curves that are even flatter than observed in the Milky Way ( figure 9 ). Most claims of a detected 2175 Å extinction feature in GRB afterglows are based on photometric data, and although these detections are often highly significant, spectroscopic data are necessary to study the profile of the feature.

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When [ 219 ] used the afterglow SED extinction, as in [ 282 ], rather than dust depletion to trace the dust on the same sample of GRB afterglows, they no longer found a strong trend between the dust-to-metals ratio with metallicity.

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