The radio afterglow from GRB 980519: A test of the jet and circumstellar models

D. A. Frail*, S. R. Kulkarni, R. Sari, G. B. Taylor, D. S. Shepherd, J. S. Bloom, C. H. Young, L. Nicastro, N. Masetti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


We present multifrequency radio observations from the afterglow of GRB 980519 beginning 7.2 hr 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.

Original languageAmerican English
Pages (from-to)559-564
Number of pages6
JournalAstrophysical Journal
Issue number2 PART 1
StatePublished - 10 May 2000
Externally publishedYes


  • Cosmology: observations
  • Gamma rays: bursts
  • Radio continuum: general


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