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    GRB 081203A: Swift UVOT captures the earliest ultraviolet spectrum of a gamma-ray burst

    Access Status
    Fulltext not available
    Authors
    Kuin, N.
    Landsman, W.
    Page, M.
    Schady, P.
    Still, M.
    Breeveld, A.
    De Pasqualea, M.
    Roming, P.
    Brown, P.
    carter, M.
    James, C.
    Curran, Peter
    Cucchiara, A.
    Gronwall, C.
    Holland, S.
    Hoversten, E.
    Hunsberger, S.
    Kennedy, T.
    Koch, S.
    Lamoureux, H.
    Marshall, F.
    Oates, S.
    Parsons, A.
    Palmer, D.
    Smith, P.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kuin, N. and Landsman, W. and Page, M. and Schady, P. and Still, M. and Breeveld, A. and De Pasqualea, M. et al. 2009. GRB 081203A: Swift UVOT captures the earliest ultraviolet spectrum of a gamma-ray burst. Monthly Notices of the Royal Astronomical Society: Letters. 395: pp. L21-L24.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    Additional URLs
    http://mnrasl.oxfordjournals.org/content/395/1/L21.full.pdf+html
    ISSN
    1745-3925
    URI
    http://hdl.handle.net/20.500.11937/10158
    Collection
    • Curtin Research Publications
    Abstract

    We present the earliest ultraviolet (UV) spectrum of a gamma-ray burst (GRB) as observedwith the Swift Ultra-Violet/Optical Telescope (UVOT). The GRB 081203A spectrum wasobserved for 50 s with the UV-grism starting 251 s after the Swift-Burst-Alert-Telescope(BAT) trigger. During this time, the GRB was ˜13.4 mag (u filter) and was still rising to itspeak optical brightness. In the UV-grism spectrum, we find a damped Lya line, Lyß and theLyman continuum break at a redshift z = 2.05 ± 0.01. A model fit to the Lyman absorptionimplies a gas column density of log NHI = 22.0 ± 0.1 cm-2, which is typical of GRB hostgalaxies with damped Lya absorbers. This observation of GRB 081203A demonstrates thatfor brighter GRBs (v ˜ 14 mag) with moderate redshift (0.5 < z < 3.5) the UVOT is able toprovide redshifts, and probe for damped Lya absorbers within 4–6 min from the time of theSwift-BAT trigger.

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