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    Rapid-response radio observations of short GRB 181123B with the Australia Telescope Compact Array

    90130.pdf (4.847Mb)
    Access Status
    Open access
    Authors
    Anderson, Gemma
    Bell, M.E.
    Stevens, J.
    Aksulu, M.D.
    Miller-Jones, James
    Horst, AJ van der
    Wijers, R.A.M.J.
    Rowlinson, A.
    Bahramian, Arash
    Hancock, Paul
    Macquart, Jean-Pierre
    Ryder, S.D.
    Plotkin, Richard
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Anderson, G.E. and Bell, M.E. and Stevens, J. and Aksulu, M.D. and Miller-Jones, J.C.A. and Horst, A.J.V.D. and Wijers, R.A.M.J. et al. 2021. Rapid-response radio observations of short GRB 181123B with the Australia Telescope Compact Array. Monthly Notices of the Royal Astronomical Society. 503 (3): pp. 4372-4386.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stab727
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/FT140101082
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/90306
    Collection
    • Curtin Research Publications
    Abstract

    We introduce the Australia Telescope Compact Array (ATCA) rapid-response mode by presenting the first successful trigger on the short-duration gamma-ray burst (GRB) 181123B. Early-time radio observations of short GRBs may provide vital insights into the radio afterglow properties of Advanced LIGO- and Virgo-detected gravitational wave events, which will in turn inform follow-up strategies to search for counterparts within their large positional uncertainties. The ATCA was on target within 12.6 hr post-burst, when the source had risen above the horizon. While no radio afterglow was detected during the 8.3 hr observation, we obtained force-fitted flux densities of $7 \pm 12$ and $15 \pm 11~\mu$Jy at 5.5 and 9 GHz, respectively. Afterglow modelling of GRB 181123B showed that the addition of the ATCA force-fitted radio flux densities to the Swift X-ray Telescope detections provided more stringent constraints on the fraction of thermal energy in the electrons (log$\epsilon_e = -0.75^{+0.39}_{-0.40}$ rather than log$\epsilon_e = -1.13^{+0.82}_{-1.2}$ derived without the inclusion of the ATCA values), which is consistent with the range of typical $\epsilon_e$ derived from GRB afterglow modelling. This allowed us to predict that the forward shock may have peaked in the radio band $\sim10$ days post-burst, producing detectable radio emission $\gtrsim3-4$ days post-burst. Overall, we demonstrate the potential for extremely rapid radio follow-up of transients and the importance of triggered radio observations for constraining GRB blast wave properties, regardless of whether there is a detection, via the inclusion of force-fitted radio flux densities in afterglow modelling efforts.

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