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Title: Broadband modelling of short gamma-ray bursts with energy injection from magnetar spin-down and its implications for radio detectability
Authors: Gompertz, Ben P.
van der Horst, A. J.
O'Brien, Paul T.
Wynn, Graham A.
Wiersema, Klaas
First Published: 6-Feb-2015
Publisher: Oxford University Press for Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society (March 21, 2015) 448 (1): 629-641
Abstract: The magnetar model has been proposed to explain the apparent energy injection in the X-ray light curves of short gamma-ray bursts (SGRBs), but its implications across the full broadband spectrum are not well explored. We investigate the broadband modelling of four SGRBs with evidence for energy injection in their X-ray light curves, applying a physically motivated model in which a newly-formed magnetar injects energy into a forward shock as it loses angular momentum along open field lines. By performing an order of magnitude search for the underlying physical parameters in the blast wave, we constrain the characteristic break frequencies of the synchrotron spectrum against their manifestations in the available multi-wavelength observations for each burst. The application of the magnetar energy injection profile restricts the successful matches to a limited family of models that are self-consistent within the magnetic dipole spin-down framework.We produce synthetic light curves that describe how the radio signatures of these SGRBs ought to have looked given the restrictions imposed by the available data, and discuss the detectability of these signatures with present day and near future radio telescopes. Our results show that both ALMA and the upgraded VLA are now sensitive enough to detect the radio signature within two weeks of trigger in most SGRBs, assuming our sample is representative of the population as a whole. We also find that the upcoming Square Kilometer Array will be sensitive to depths greater than those of our lower limit predictions.
DOI Link: 10.1093/mnras/stu2752
ISSN: 0035-8711
eISSN: 1365-2966
Version: Published version (Publisher PDF)
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to policy in SHERPA/RoMEO. Copyright RAS. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record will be available online and this record will be updated.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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