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grb absorption spectroscopy - Inaf

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INTERVENING ABSORBERS<br />

GRB Strong MgII excess - possible explanations:<br />

• Dust extintion bias<br />

• Gravitational lensing<br />

• Local, high velocity systems related to the GRBs<br />

• Different beam size of the GRB and QSO emitting regions<br />

Variability is predicted!

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