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    Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows

    193688_98382_moin2013_0004-637X_779_2_105.pdf (345.2Kb)
    Access Status
    Open access
    Authors
    Moin, A.
    Chandra, P.
    Miller-Jones, James
    Tingay, Steven
    Taylor, G.
    Frail, D.
    Wang, Z.
    Reynolds, Cormac
    Phillips, C.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Moin, A. and Chandra, P. and Miller-Jones, J.C.A. and Tingay, S.J. and Taylor, G.B. and Frail, D.A. and Wang, Z. and Reynolds, C. and Phillips, C.J. 2013. Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows. The Astrophysical Journal. 779 (2): pp. 105:1-105:7.
    Source Title
    The Astrophysical Journal
    DOI
    10.1088/0004-637X/779/2/105
    ISSN
    0004637X
    Remarks

    Copyright © 2013 The American Astronomical Society

    URI
    http://hdl.handle.net/20.500.11937/42051
    Collection
    • Curtin Research Publications
    Abstract

    We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a plateau phase with a very shallow rise. This observed plateau phase was believed to be due to a continued energy injection mechanism that powered the forward shock, giving rise to an unusual and long-lasting afterglow. The radio afterglow of GRB 100418a was detectable several weeks after the prompt emission. We conducted long-term monitoring observations of the afterglow and attempted to test the energy injection model advocating that the continuous energy injection is due to shells of material moving at a wide range of Lorentz factors. We obtained an upper limit of γ < 7 for the expansion rate of the GRB 100418a radio afterglow, indicating that the range-of-Lorentz factor model could only be applicable for relatively slow-moving ejecta. A preferred explanation could be that continued activity of the central engine may have powered the long-lasting afterglow.

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