New ATCA HI observations toward four GRBs give higher Galactic foreground column densities than single-dish surveys and reveal a large optical depth correction for one sightline.
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Exploring the pattern of the Galactic HI foreground of GRBs with the ATCA
New ATCA HI observations toward four GRBs give higher Galactic foreground column densities than single-dish surveys and reveal a large optical depth correction for one sightline.