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    A search for fast radio bursts associated with gamma-ray bursts

    212998_212998.pdf (3.239Mb)
    Access Status
    Open access
    Authors
    Palaniswamy, D.
    Wayth, Randall
    Trott, Cathryn
    McCallum, J.
    Tingay, Steven
    Reynolds, Cormac
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Palaniswamy, D. and Wayth, R. and Trott, C. and McCallum, J. and Tingay, S. and Reynolds, C. 2014. A search for fast radio bursts associated with gamma-ray bursts. Astrophysical Journal. 790 (1): Article ID 63.
    Source Title
    Astrophysical Journal
    DOI
    10.1088/0004-637X/790/1/63
    ISSN
    0004-637X
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This is an author-created, un-copy edited version of an article accepted for publication in Astrophysical Journal. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://doi.org/10.1088/0004-637X/790/1/63

    URI
    http://hdl.handle.net/20.500.11937/17746
    Collection
    • Curtin Research Publications
    Abstract

    The detection of seven fast radio bursts (FRBs) has recently been reported. FRBs are short duration (~1 ms), highly dispersed radio pulses from astronomical sources. The physical interpretation for the FRBs remains unclear but is thought to involve highly compact objects at cosmological distance. It has been suggested that a fraction of FRBs could be physically associated with gamma-ray bursts (GRBs). Recent radio observations of GRBs have reported the detection of two highly dispersed short duration radio pulses using a 12 m radio telescope at 1.4 GHz. Motivated by this result, we have performed a systematic and sensitive search for FRBs associated with GRBs. We have observed five GRBs at 2.3 GHz using a 26 m radio telescope located at the Mount Pleasant Radio Observatory, Hobart. The radio telescope was automated to rapidly respond to Gamma-ray Coordination Network notifications from the Swift satellite and slew to the GRB position within ~140 s. The data were searched for pulses up to 5000 pc cm−3 in dispersion measure and pulse widths ranging from 640μs to 25.60 ms. We did not detect any events ≥6σ. An in depth statistical analysis of our data shows that events detected above 5σ are consistent with thermal noise fluctuations only. A joint analysis of our data with previous experiments shows that previously claimed detections of FRBs from GRBs are unlikely to be astrophysical. Our results are in line with the lack of consistency noted between the recently presented FRB event rates and GRB event rates.

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