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There is nearly a factor of four difference in the number density ofintervening MgII absorbers as determined from gamma-ray burst (GRB) and quasarlines of sight. We use a Monte-Carlo simulation to test if a dust extinctionbias can account for this discrepancy. We apply an empirically determinedrelationship between dust column density and MgII rest equivalent width tosimulated quasar sight-lines and model the underlying number of quasars thatmust be present to explain the published magnitude distribution of SDSSquasars. We find that an input MgII number density dn/dz of 0.273 +- 0.002 overthe range 0.4 <= z <= 2.0 and with MgII equivalent width W_0 >= 1.0 angstromsaccurately reproduces observed distributions. From this value, we conclude thata dust obstruction bias cannot be the sole cause of the observed discrepancybetween GRB and quasar sight-lines: this bias is likely to reduce thediscrepancy only by ~10%.

Dusty MgII Absorbers: Implications for the GRB/Quasar Incidence Discrepancy