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The optical afterglow and host galaxy of GRB 000926

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arxiv astro-ph/0110603 v1 submitted 2001-10-29 astro-ph

The optical afterglow and host galaxy of GRB 000926

J.P.U. Fynbo (ESO , Garching , D) , J. Gorosabel (DSRI , DK) , P. Moller (ESO , J. Hjorth (Copenhagen Observatory , M.I. Andersen (Division of Astronomy
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Oulu University SF) M.P. Egholm (IFA Aarhus B.L. Jensen (Copenhagen Observatory H. Pedersen (Copenhagen Observatory B. Thomsen (IFA M. Weidinger (IFA
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keywords burstopticalgalaxyhostafterglowbandimagingly-alpha
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In this paper we illustrate with the case of GRB 000926 how Gamma Ray Bursts (GRBs) can be used as cosmological lighthouses to identify and study star forming galaxies at high redshifts. The optical afterglow of the burst was located with optical imaging at the Nordic Optical Telescope 20.7 hours after the burst. Rapid follow-up spectroscopy allowed the determination of the redshift of the burst and a measurement of the host galaxy HI-column density in front of the burst. With late-time narrow band Ly-alpha as well as broad band imaging, we have studied the emission from the host galaxy and found that it is a strong Ly-alpha emitter in a state of active star formation.

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