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    Low frequency view of GRB 190114C reveals time varying shock micro-physics

    90129.pdf (19.53Mb)
    Access Status
    Open access
    Authors
    Misra, K.
    Resmi, L.
    Kann, D.A.
    Marongiu, M.
    Moin, A.
    Klose, S.
    Bernardi, G.
    Postigo, A.D.U.
    Jaiswal, V.K.
    Schulze, S.
    Perley, D.A.
    Ghosh, A.
    Dimple, D.
    Kumar, H.
    Gupta, R.
    Michałowski, M.J.
    Martín, S.
    Cockeram, A.
    Cherukuri, S.V.
    Bhalerao, V.
    Anderson, Gemma
    Pandey, S.B.
    Anupama, G.C.
    Thöne, C.C.
    Barway, S.
    Wieringa, M.H.
    Fynbo, J.P.U.
    Habeeb, N.
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Misra, K. and Resmi, L. and Kann, D.A. and Marongiu, M. and Moin, A. and Klose, S. and Bernardi, G. et al. 2021. Low frequency view of GRB 190114C reveals time varying shock micro-physics. Monthly Notices of the Royal Astronomical Society. 504 (4): pp. 5685-5701.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stab1050
    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/DE180100346
    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/20.500.11937/90305
    Collection
    • Curtin Research Publications
    Abstract

    We present radio and optical afterglow observations of the TeV-bright long gamma-ray burst 190114C at a redshift of z = 0.425, which was detected by the Major Atmospheric Gamma Imaging Cherenkov telescope. Our observations with Atacama Large Millimeter/submillitmeter Array, Australia Telescope Compact Array, and upgraded Giant Metre-wave Radio Telescope were obtained by our low frequency observing campaign and range from ∼1 to ∼140 d after the burst and the optical observations were done with three optical telescopes spanning up to ∼25 d after the burst. Long-term radio/mm observations reveal the complex nature of the afterglow, which does not follow the spectral and temporal closure relations expected from the standard afterglow model. We find that the microphysical parameters of the external forward shock, representing the share of shock-created energy in the non-thermal electron population and magnetic field, are evolving with time. The inferred kinetic energy in the blast-wave depends strongly on the assumed ambient medium density profile, with a constant density medium demanding almost an order of magnitude higher energy than in the prompt emission, while a stellar wind-driven medium requires approximately the same amount energy as in prompt emission.

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