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Prochter et al. 2006 recently found that the number density of strongintervening 0.5<z<2 MgII absorbers detected in gamma-ray burst (GRB) afterglowspectra is nearly 4 times larger than in QSO spectra. We have conducted asimilar study using CIV absorbers. Our CIV sample, consisting of a total of 20systems, is drawn from 3 high resolution and high to moderate S/N VLT/UVESspectra of 3 long-duration GRB afterglows, covering the redshift interval 1.6<z<3.1. The column density distribution and number density of this sample do notshow any statistical difference with the same quantities measured in QSOspectra. We discuss several possibilities for the discrepancy between CIV andMgII absorbers and conclude that a higher dust extinction in the MgII QSOsamples studied up to now would give the most straightforward solution.However, this effect is only important for the strong MgII absorbers.Regardless of the reasons for this discrepancy, this result confirms once morethat GRBs can be used to detect a side of the universe that was unknown before,not necessarily connected with GRBs themselves, providing an alternative andfundamental investigative tool of the cosmic evolution of the universe.

Intervening Metal Systems in GRB and QSO sight-lines: The Mgii and Civ Question