AAS 207th Meeting, 8-12 January 2006
Session 168 Rossi Prize Lecture
Invited, Wednesday, 4:30-5:20pm, January 11, 2006, Ballroom/Salon 2

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[168.01] The Supernova Gamma-Ray Burst Connection

S. E. Woosley (UCSC)

There is now clear evidence for Type I supernovae happening in coincidence with two long soft gamma-ray bursts (GRBs) and compelling observations that suggest this may be a common occurrence. At the same time, it is clear that only a small fraction, ~1%, of supernovae make GRBs. Why do some stars die one way, and others, another? I will argue that GRBs are the deaths of stars which die with unusually large amounts of rotation in their inner 3 solar masses. Models that produce slowly rotating pulsars most of the time and GRBs, in rare cases, especially in regions of low metallicity, will be presented. I will also discuss models for the central engine of GRBs, with emphasis on the collapsar model, and observable diagnostics to help distinguish these models. Finally, I will discuss transition events like SN 2005bf, which probably was not a GRB at any angle, but may have involved the same central engine.

This research was supported by the NSF, NASA, and the DOE.

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