Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-31
Astrophys.J. 614 (2004) L17
Astronomy and Astrophysics
Astrophysics
5 pages, 1 figure, minor changes, ApJL accepted
Scientific paper
10.1086/425498
The central engine of gamma-ray bursts (GRBs) is believed to eject double-sided ultra-relativistic jets. For an observed GRB, one of the twin jets should point toward us, and is responsible for the prompt gamma-ray and subsequent afterglow emission. We consider in this Letter the other receding jet, which will give rise to late-time radio re-brightening (RRB) when it becomes non-relativistic (NR) and radiative isotropic. The RRB peaks at a time $5t_{NR}=2(E_{j,51}/n)^{1/3}$ yr after the GRB, where $t_{NR}$ is the observed NR timescale for the preceding jet, $E_j$ is the jet energy and $n$ is the ambient medium density. The peak flux is comparable to the preceding-jet emission at $t_{NR}$. We expect the RRB of GRB 030329 1.7 yr after the burst with a flux $\sim0.6$ mJy at 15 GHz. The cases of GRBs 970508 and 980703 have also been discussed. The detection of RRB, which needs dense monitoring campaign even a few years after a GRB, will be the direct evidence for the existence of double-sided jets in GRBs, and prove the black hole-disk system formation in the cores of progenitors.
Li Zhuo
Song Li Ming
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