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dc.contributor.authorMoin, A.
dc.contributor.authorChandra, P.
dc.contributor.authorMiller-Jones, James
dc.contributor.authorTingay, Steven
dc.contributor.authorTaylor, G.
dc.contributor.authorFrail, D.
dc.contributor.authorWang, Z.
dc.contributor.authorReynolds, Cormac
dc.contributor.authorPhillips, C.
dc.identifier.citationMoin, A. and Chandra, P. and Miller-Jones, J.C.A. and Tingay, S.J. and Taylor, G.B. and Frail, D.A. and Wang, Z. and Reynolds, C. and Phillips, C.J. 2013. Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows. The Astrophysical Journal. 779 (2): pp. 105:1-105:7.

We present the results of our radio observational campaign of gamma-ray burst (GRB) 100418a, for which we used the Australia Telescope Compact Array, the Very Large Array, and the Very Long Baseline Array. GRB 100418a was a peculiar GRB with unusual X-ray and optical afterglow profiles featuring a plateau phase with a very shallow rise. This observed plateau phase was believed to be due to a continued energy injection mechanism that powered the forward shock, giving rise to an unusual and long-lasting afterglow. The radio afterglow of GRB 100418a was detectable several weeks after the prompt emission. We conducted long-term monitoring observations of the afterglow and attempted to test the energy injection model advocating that the continuous energy injection is due to shells of material moving at a wide range of Lorentz factors. We obtained an upper limit of γ < 7 for the expansion rate of the GRB 100418a radio afterglow, indicating that the range-of-Lorentz factor model could only be applicable for relatively slow-moving ejecta. A preferred explanation could be that continued activity of the central engine may have powered the long-lasting afterglow.

dc.publisherInstitute of Physics Publishing, Inc.
dc.subjectradio continuum: general
dc.subjectradiation mechanisms: non-thermal
dc.subjectgamma-ray burst: individual (GRB 100418a)
dc.subjectrelativistic processes
dc.subjectstars: winds
dc.titleRadio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows
dc.typeJournal Article
dcterms.source.titleThe Astrophysical Journal

Copyright © 2013 The American Astronomical Society

curtin.accessStatusOpen access

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