Journal
ASTRONOMY & ASTROPHYSICS
Volume 442, Issue 2, Pages L21-U6Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:200500181
Keywords
gamma rays : bursts; galaxies : distances and redshifts; cosmology : observations
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We present early WHT ISIS optical spectroscopy of the afterglow of gamma-ray burst GRB050730. The spectrum shows a DLA system with the highest measured hydrogen column to date: N(H I) = 22.1 +/- 0.1 at the third-highest GRB redshift z = 3.968. Our analysis of the Swift XRT X-ray observations of the early afterglow show X-ray flares accompanied by decreasing X-ray absorption. From both the optical and the X-ray spectra we constrain the dust and gas properties of the host galaxy. We find the host to be a low metallicity galaxy, with low dust content. Much of the X-ray absorbing gas is situated close to the GRB, whilst the H I absorption causing the DLA is most likely located further out.
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