Mar 15, 1999
Intro. Obs. Overview of Afterglows
Kevin Hurley
The solved and unsolved mysteries in gamma-ray bursts are reviewed.
Although the GRB distance scale has been determined, it only applies
to a particular class of gamma-ray bursts: those with long time histories
and bright X-ray afterglows. The short bursts, which appear to consititute
a separate class, still have no known counterparts, and their distance
scale could be different. Indeed, their number-intensity relation differs
significantly from that of GRBs as a whole, suggesting that their spatial
distribution in the radial direction is unusual. Another enigma is the
possible GRB - Supernova connection. And finally, lines in GRB spectra have
come back as an issue.
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