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    Late-time Observations of GRB 080319B: Jet Break, Host Galaxy, and Accompanying Supernova

    Access Status
    Fulltext not available
    Authors
    Tanvir, N.
    Rol, E.
    Levan, A.
    Svensson, K.
    Fruchter, A.
    Granot, J.
    O’Brien, P.
    Wiersema, K.
    Starling, R.
    Jakobsson, P.
    Fynbo, J.
    Hjorth, J.
    Curran, Peter
    van der Horst, A.
    Kouveliotou, C.
    Racusin, J.
    Burrows, D.
    Genet, F.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Tanvir, N. and Rol, E. and Levan, A. and Svensson, K. and Fruchter, A. and Granot, J. and O’Brien, P. et al. 2010. Late-time Observations of GRB 080319B: Jet Break, Host Galaxy, and Accompanying Supernova. The Astrophysical Journal. 725: pp. 625-632.
    Source Title
    The Astrophysical Journal
    Additional URLs
    http://iopscience.iop.org/0004-637X/725/1/625/pdf/0004-637X_725_1_625.pdf
    ISSN
    0004637X
    URI
    http://hdl.handle.net/20.500.11937/27456
    Collection
    • Curtin Research Publications
    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 (HubbleSpace Telescope, Gemini, and Very Large Telescope) and X-ray (Chandra) observations, which confirm that anachromatic break occurred in the power-law afterglow light curve at~ 11 days post-burst. This most likely indicatesthat the gamma-ray burst (GRB) outflow was collimated, which for a uniform jet would imply a total energy inthe jet Ejet 1052 erg. Our observations also show a late-time excess of red light, which is well explained ifthe GRB was accompanied by a supernova (SN), similar to those seen in some other long-duration GRBs. Thelatest 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, whichis suggestive of a low-metallicity environment. Intriguingly, the properties of this extreme event—a small hostand bright SN—are entirely typical of the very low luminosity bursts such as GRB 980425 and GRB 060218.

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