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grb absorption spectroscopy - Inaf

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Average [C/Fe] ratio is<br />

0.08±0.24, consistent with<br />

values predicted for a<br />

galaxy younger than 1 Gyr<br />

undergoing star formation<br />

[C/Fe] of component 3 is<br />

0.53±0.23, larger than in 2<br />

(-0.15±0.13), with [C]<br />

roughly constant.<br />

GRB 050730<br />

Since Fe dust grains are more efficiently destroyed than C dust grains by<br />

the GRB UV flux and blast wave (Perna, Lazzati & Fiore 2003), this<br />

suggests that component 2 is closer to the GRB than component 3.

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