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        Late-time observations of GRB 080319B: jet break, host galaxy and accompanying supernova

        Author
        Tanvir, N.
        Rol, E.
        Levan, A.
        Svensson, K.
        Fruchter, A.S.
        Granot, J.
        O'Brien, P.T.
        Wiersema, K.
        Starling, R.L.
        Jakobsson, P.
        Fynbo, J.
        Hjorth, J.
        Curran, P.
        van der Horst, A.J.
        Kouveliotou, C.
        Racusin, J.L.
        Burrows, D.N.
        Genet, F.
        Attention
        2299/5086
        Abstract
        The Swift-discovered GRB 080319B was by far the most distant source ever observed at naked-eye brightness, reaching a peak apparent magnitude of 5.3 at a redshift of z = 0.937. We present our late-time optical (Hubble Space Telescope, Gemini, and Very Large Telescope) and X-ray (Chandra) observations, which confirm that an achromatic break occurred in the power-law afterglow light curve at ~11 days post-burst. This most likely indicates that the gamma-ray burst (GRB) outflow was collimated, which for a uniform jet would imply a total energy in the jet E jet 1052 erg. Our observations also show a late-time excess of red light, which is well explained if the GRB was accompanied by a supernova (SN), similar to those seen in some other long-duration GRBs. The latest observations are dominated by light from the host and show that the GRB took place in a faint dwarf galaxy (r(AB) 27.0, rest frame MB –17.2). This galaxy is small even by the standards of other GRB hosts, which is suggestive of a low-metallicity environment. Intriguingly, the properties of this extreme event—a small host and bright SN—are entirely typical of the very low luminosity bursts such as GRB 980425 and GRB 060218.
        Publication date
        2010
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.1088/0004-637X/725/1/625
        Other links
        http://hdl.handle.net/2299/5086
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