Abstract
Our understanding of the engines and progenitors of gamma-ray bursts has
expanded through the ages as a broader set of diagnostics has allowed us to
test our understanding of these objects. Here we review the history of the
growth in our understanding, focusing on 3 leading engines and 9 potential
progenitors. The first gravitational wave detection of a short burst is the
latest in a series of breakthrough observations shaping this understanding and
we study the importance of multi-diagnostic, multi-messenger observations on
these engines and their progenitors. Our understanding based on a detailed
study of nearby bursts can be applied to make predictions for the trends
expected as we begin to observe high redshift bursts and we discuss these
trends.
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