  The suggested association between the sources of gamma-ray bursts (GRB's) and
the sources of ultra-high energy cosmic rays (UHECR's) is based on two
arguments: (i) The average energy generation rate of UHECR's is similar to the
gamma-ray generation rate of GRB's, and (ii) The constraints that UHECR sources
must satisfy to allow proton acceleration to >10^{20} eV are similar to those
inferred for GRB sources from gamma-ray observations. We show that recent GRB
and UHECR observations strengthen both arguments, and hence strengthen the
suggested association.
