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    Constraining the energy budget of GRB 080721

    225807_131978_MNRAS-2009-Starling-90-9-1-1.pdf (2.219Mb)
    Access Status
    Open access
    Authors
    Starling, R.
    Rol, E.
    van der Horst, A.
    Yoon, S.
    Palshin, V.
    Ledoux, C.
    Page, K.
    Fynbo, J.
    Wiersema, K.
    Tanvir, N.
    Jakobsson, P.
    Guidorzi, C.
    Curran, Peter
    Levan, A.
    O’Brien, P.
    Osborne, J.
    Svinkin, D.
    de Ugarte Postigo, A.
    Oosting, T.
    Howarth, I.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Starling, R. and Rol, E. and van der Horst, A. and Yoon, S. and Palshin, V. and Ledoux, C. and Page, K. et al. 2009. Constraining the energy budget of GRB 080721. Monthly Notices of the Royal Astronomical Society. 400 (1): pp. 90-99.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2009.15443.x
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2009 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/35469
    Collection
    • Curtin Research Publications
    Abstract

    We follow the bright, highly energetic afterglow of Swift-discovered GRB 080721 at z= 2.591 out to 36 d or 3 × 10(6) s since the trigger in the optical and X-ray bands. We do not detect a break in the late-time light curve inferring a limit on the opening angle of [graphic] and setting tight constraints on the total energy budget of the burst of Eγ≥ 9.9 × 10(51) erg within the fireball model. To obey the fireball model closure relations, the gamma-ray burst (GRB) jet must be expanding into a homogeneous surrounding medium and likely lies behind a significant column of dust. The energy constraint we derive can be used as an observational input for models of the progenitors of long GRBs: we discuss how such high collimation-corrected energies could be accommodated with certain parameters of the standard massive star core-collapse models. We can, however, most probably rule out a magnetar progenitor for this GRB which would require 100 per cent efficiency to reach the observed total energy.

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