... metallicity

Based on observations collected at the European Southern Observatory, Chile, by GRACE (Gamma-Ray Burst Afterglow Collaboration at ESO), under program ID 70.D-0523(B), and with NASA's Hubble Space Telescope.

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... IRAF

IRAF is distributed by the National Optical Astronomy Observatories, which are operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

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... 2MASS

See http://www.ipac.caltech.edu/2mass/

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... [Si/Fe]

Observationally, $\rm [S/Si]=0$ in gaseous absorbers when there is neither dust depletion nor ionization effects.

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... routine

See http://stsdas.stsci.edu/pydrizzle/multidrizzle

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... Swift

See http://swift.gsfc.nasa.gov/

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... EXIST

See http://exist.gsfc.nasa.gov/

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