Lecture 33

GRB Populations

• burst duration distribution
• duration correlation with hardness ("color") scatterplots here, here
• afterglow tabulation

Beaming

• evidence
• implications

Afterglow Physics: Relativistic Fireball

GRB-Supernova Connection

• GRB 980326 and SN 1998bw
• GRB 030329 and SN 2003dh; other spectra here
• GRB 021211 and SN 2002lt

Central Engine Physics

• long-soft bursts
  • hypernovae
  • collapsars
• short-hard bursts:
  • compact object mergers--neutron stars, black holes; movie: Illinois relativity group
  • collapsars; movie: Illinois relativity group