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    Limits on Precursor and Afterglow Radio Emission from a Fast Radio Burst in a Star-forming Galaxy

    91377.pdf (1.305Mb)
    Access Status
    Open access
    Authors
    Bhandari, S.
    Bannister, K.W.
    Lenc, E.
    Cho, H.
    Ekers, Ronald
    Day, C.K.
    Deller, A.T.
    Flynn, C.
    James, Clancy
    Macquart, Jean-Pierre
    Mahony, E.K.
    Marnoch, L.
    Moss, V.A.
    Phillips, C.
    Prochaska, J.X.
    Qiu, H.
    Ryder, S.D.
    Shannon, Ryan
    Tejos, N.
    Wong, O.I.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bhandari, S. and Bannister, K.W. and Lenc, E. and Cho, H. and Ekers, R. and Day, C.K. and Deller, A.T. et al. 2020. Limits on Precursor and Afterglow Radio Emission from a Fast Radio Burst in a Star-forming Galaxy. Astrophysical Journal Letters. 901 (2): ARTN L20.
    Source Title
    Astrophysical Journal Letters
    DOI
    10.3847/2041-8213/abb462
    ISSN
    2041-8205
    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/DP180100857
    http://purl.org/au-research/grants/arc/FT150100415
    http://purl.org/au-research/grants/arc/FT190100155
    URI
    http://hdl.handle.net/20.500.11937/91553
    Collection
    • Curtin Research Publications
    Abstract

    We present a new fast radio burst (FRB) at 920 MHz discovered during commensal observations conducted with the Australian Square Kilometre Array Pathfinder (ASKAP) as part of the Commensal Real-time ASKAP Fast Transients (CRAFT) survey. FRB 191001 was detected at a dispersion measure (DM) of 506.92(4) pc cm-3 and its measured fluence of 143(15) Jy ms is the highest of the bursts localized to host galaxies by ASKAP to date. The subarcsecond localization of the FRB provided by ASKAP reveals that the burst originated in the outskirts of a highly star-forming spiral in a galaxy pair at redshift z = 0.2340(1). Radio observations show no evidence for a compact persistent radio source associated with the FRB 191001 above a flux density of 15 μJy. However, we detect diffuse synchrotron radio emission from the disk of the host galaxy that we ascribe to ongoing star formation. FRB 191001 was also detected as an image-plane transient in a single 10 s snapshot with a flux density of 19.3 mJy in the low-time-resolution visibilities obtained simultaneously with CRAFT data. The commensal observation facilitated a search for repeating and slowly varying radio emissions 8 hr before and 1 hr after the burst. We found no variable radio emission on timescales ranging from 1 ms to 1.4 hr. We report our upper limits and briefly review FRB progenitor theories in the literature that predict radio afterglows. Our data are still only weakly constraining of any afterglows at the redshift of the FRB. Future commensal observations of more nearby and bright FRBs will potentially provide stronger constraints.

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