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The spatiotemporal coincidence of supernova (SN) 1998bw and gamma-ray burst(GRB) 980425 and this supernova's unusual optical and radio properties haveprompted many theoretical models that produce GRBs from supernovae. We reviewthe salient features of our simple, spherical model in which an energeticsupernova explosion shock accelerates a small fraction of the progenitor'sstellar envelope to mildly relativistic velocities. This material carriessufficient energy to produce a weak GRB and a bright radio supernova through anexternal shock against a dense stellar wind.Comment: 3 pages, To appear in Proceedings of the 20th Texas Symposium on  Relativistic Astrophysics, eds. J. C. Wheeler & H. Martel, AI

The trans-relativistic blast wave model for SN 1998bw and GRB 980425