The Radio Afterglow From GRB 980519: A Test of the Jet and Circumstellar Models

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dc.creatorFrail, D. A.
dc.creatorKulkarni, S. R.
dc.creatorSari, R.
dc.creatorTaylor, G. B.
dc.creatorShepherd, D. S.
dc.creatorBloom, J. S.
dc.creatorYoung, C. H.
dc.creatorNicastro, L.
dc.creatorMasetti, N.
dc.date1999-10-04
dc.date.accessioned2026-07-07T11:08:30Z
dc.date.available2026-07-07T11:08:30Z
dc.descriptionWe present multi-frequency radio observations from the afterglow of GRB 980519 beginning 7.2 hours after the gamma-ray burst and ending 63 days later. The fast decline in the optical and X-ray light curves for this burst has been interpreted either as afterglow emission originating from a collimated outflow -- a jet -- or the result of a blast wave propagating into a medium whose density is shaped by the wind of an evolved massive star. These two models predict divergent behavior for the radio afterglow, and therefore, radio observations are capable, in principle, of discriminating between the two. We show that a wind model describes the subsequent evolution of the radio afterglow rather well. However, we see strong modulation of the light curve, which we interpret as diffractive scintillation. These variations prevent us from decisively rejecting the jet model.
dc.descriptionApJ, submitted
dc.identifierhttps://arxiv.org/abs/astro-ph/9910060
dc.identifierhttp://arxiv.org/abs/astro-ph/9910060
dc.identifierAstrophys.J.534:559-564,2000
dc.identifierdoi:10.1086/308802
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190155
dc.subjectAstrophysics
dc.titleThe Radio Afterglow From GRB 980519: A Test of the Jet and Circumstellar Models
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