[email protected] Introduction to GRB: Classifications and Progenitors. Chang-Hwan Lee @. GRB. Introduction to GRB. Short Hard GRB. NS-NS, NS-BH Mergers. Hee-Suk Cho & Soomin Jeong’s Talk. Long Soft GRB. Supernova Association. Another class ?. Some Recent Issues. GRB. Gamma-ray Bursts.
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Introduction to GRB:
Classifications and Progenitors
Chang-Hwan Lee @
Introduction to GRB
Short Hard GRB
NS-NS, NS-BH Mergers
Hee-Suk Cho & Soomin Jeong’s Talk.
Long Soft GRB
Another class ?
Some Recent Issues
Duration: milli sec - min
1970s : Vela Satellite
1990s: CGRO, Beppo-SAX
2000s: HETE-II, Swift
Two groups of GRBs
HMBH (High-mass black hole)
5-10 solar mass
Short-Hard Gamma-ray Bursts
NS (radio pulsar) which coalesce within Hubble time
Globular Cluster : no binary evolution
White Dwarf companion
Short-Hard Gamma-ray Burst : Colliding NS binaries
Very Important for Gravitational Waves, too
Science 308 (2005) 939
Laser Interferometer Gravitational Wave Observatory
LIGO I : in operation (since 2004)
LIGO II: in progress (2010 ?)
Network of Interferometers
LIGO Louisiana 4km
Long-duration Gamma-ray Bursts
Long-duration GRBs: Afterglow
Host Galaxy Association
= Distance Estimation
What caused GRB/Supernova ?
Most-likely Black Holes
Callapsar: Asymmetric Explosion of a Massive Star Most-likely Rapid-Rotation
How to form rapidly spinning black holes?
Most likely in BH binaries (Soft X-ray Transients)
Companion star can keep BH progenitor rotating
Formation of rapidly rotating stellar mass BHs
Q) How to generate chaotic(?) light curves ?Q) Is there a model that explains all the light curves ?
A Generic GRB Fireball
central photosphere internal external shocks
engine shocks (reverse & forward)
Fraction of fainter or equal pixels
GRBs are concentrated in the more bright regions of galaxy
GRBs from low metallicity galaxies
GRB hosts (blue color) are fainter & smaller
Fruchter et al.
The existence of new class:still open questions
Classifications:Is there third or sub-classes ?
Progenitors:S-GRB: NS-NS, NS-BH, …L-GRB: with SN, w/o SN, ….
Properties of host galaxies & afterglow!
-- Central Engine -- Statistical Approaches
Observations & Experiment
-- afterglow observations (SHBs & L-GRBs)
-- gamma-ray & X-ray telescope