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    Two populations of gamma-ray burst radio afterglows

    Access Status
    Fulltext not available
    Authors
    Hancock, Paul
    Gaensler, B.
    Murphy, T.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Hancock, P. and Gaensler, B. and Murphy, T. 2013. Two populations of gamma-ray burst radio afterglows. The Astrophysical Journal. 776 (2): pp. 1-8.
    Source Title
    The Astrophysical Journal
    Additional URLs
    http://iopscience.iop.org/0004-637X/776/2/106/pdf/0004-637X_776_2_106.pdf
    ISSN
    0004-637X
    URI
    http://hdl.handle.net/20.500.11937/8976
    Collection
    • Curtin Research Publications
    Abstract

    The detection rate of gamma-ray burst (GRB) afterglows is ~30% at radio wavelengths, much lower than in the X-ray (~95%) or optical (~70%) bands. The cause of this low radio detection rate has previously been attributed to limited observing sensitivity. We use visibility stacking to test this idea, and conclude that the low detection rate is instead due to two intrinsically different populations of GRBs: radio-bright and radio-faint. We calculate that nomore than 70% of GRB afterglows are truly radio-bright, leaving a significant population of GRBs that lack a radio afterglow. These radio-bright GRBs have higher gamma-ray fluence, isotropic energies, X-ray fluxes, and optical fluxes than the radio-faint GRBs, thus confirming the existence of two physically distinct populations. We suggest that the gamma-ray efficiency of the prompt emission is responsible for the difference between the two populations. We also discuss the implications for future radio and optical surveys.

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