Constraint on the counter-jet emission in gamma-ray burst afterglows from GRB 980703

Astronomy and Astrophysics – Astronomy

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Gamma Rays: Bursts, Ism: Jets And Outflows, Methods: Numerical

Scientific paper

We present a numerical investigation of emission from the receding jet of gamma-ray bursts. It is found that the peak time of the receding jet emission is significantly affected by synchrotron self-absorption in radio wavelengths. However, the receding jet component is generally very weak. It is observable mainly for those nearby events in a dense environment. Although GRB 980703 has been observed in radio wavelengths for more than 1000 days, we argue that the receding jet emission still has not been detected for this event. Actually, it is completely submerged by the host galaxy.

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