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The late-time high-resolution X-ray and radio observations ofGRB980425/SN1998bw, the closest known gamma ray burst (GRB) associated with asupernova (SN) explosion, may have actually resolved the hyperluminal sourcethat produced the GRB and its afterglow. Its hyperluminal speed ~350c isconsistent with that expected in the cannonball (CB) model of GRBs. Theobserved superluminal expansion of the late-time radio image ofGRB030329/SN2003dh, the GRB with the brightest and longest followed up radioafterglow to date, is also consistent with that expected in the CB model ofGRBs and extrapolates to an apparent early-time hyperluminal expansion.

Hyperluminal Signatures in the Afterglows of Gamma-Ray Bursts 980425 and 030329