1 Introduction

Four out of five radio afterglows (see Table 1) have been observed with VLBI techniques. In this paper we review what has been learned so far, and discuss future applications.

**Table 1:** Radio afterglows as of 1998 November
$\begin{table} \begin{displaymath} \begin{array} {p{0.5\linewidth}lccc} \hline ... ...hrm{a}}$] No VLBI observations were attempted for G980519.\end{list} \end{table}$

Up: VLBI observations of GRB