Short Hard Gamma Ray Bursts And Their Afterglows

Abstract

Long duration gamma ray bursts (GRBs) and X-ray flashes (XRFs) are produced by highly- relativistic jets ejected in core-collapse supernova explosions. The origin of short hard gamma-ray bursts (SHBs) has not been established. They may be produced by highly relativistic jets ejected in various processes: mergers of compact stellar objects; large-mass accretion episodes onto compact stars in close binaries or onto intermediate-mass black holes in dense stellar regions; phase transition of compact stars. Natural environments of such events are the dense cores of globular clusters, superstar clusters and young supernova remnants. We have used the cannonball model of GRBs to analyze all Swift SHBs with a well-sampled X-ray afterglow. We show that their prompt gamma-ray emission can be explained by inverse Compton scattering (ICS) of the progenitor's glory light, and their extended soft emission component by ICS of high density light or synchrotron radiation (SR) in a high density interstellar medium within the cluster. The mechanism generating the afterglow is synchrotron radiation outside the cluster. No associated supernova could be detected in the low luminosity nearby GRBs 060614 and 060505. We interpret them as SHBs seen relatively far off axis.

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• The cannonball model of long GRBs - overview
• Conical Fireballs, Cannonballs, And Jet-Breaks In The Afterglows Of Gamma Ray Bursts
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• A history of the gamma-ray burst flux at the Earth from Galactic globular clusters
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• The Anticipated Supernova Associated with GRB090618
• Correlated Spectral And Temporal Behaviour Of Late-Time Afterglows Of Gamma Ray Bursts
• GRB 130603B: No Compelling Evidence For Neutron Star Merger
• Cannonball model diagnosis of the short gamma ray burst 170817A
• On The Evolution Of The Spectral Break In The Afterglow Of Gamma Ray Bursts