Gamma-Ray Bursts and Related Phenomena

Abstract

Gamma-ray bursts (GRBs) have puzzled astronomers since their accidental discovery in the sixties. The BATSE detector on the COMPTON-GRO satellite has been detecting one burst per day for the last six years. Its findings have revolutionized our ideas about the nature of these objects. They have shown that GRBs are at cosmological distances. This idea was accepted with difficulties at first. However, the recent discovery of an x-ray afterglow by the Italian/Dutch satellite BeppoSAX led to a detection of high red-shift absorption lines in the optical afterglow of GRB970508 and to a confirmation of its cosmological origin. The simplest and practically inevitable interpretation of these observations is that GRBs result from the conversion of the kinetic energy of ultra-relativistic particles flux to radiation in an optically thin region. The "inner engine" that accelerates the particles or generates the Poynting flux is hidden from direct observations. Recent studies suggest the ``internal-external'' model: internal shocks that take place within the relativistic flow produce the GRB while the subsequent interaction of the flow with the external medium produce the afterglow. The ``inner engine'' that produces the flow is, however, hidden from direct observations. We review this model with a specific emphasis on its implications to underground physics.

Latex 8 pages, a short review paper that will appear in the proceedings of the Fifth Conference on Underground Physics (TAUP97)

References in corpus (10)

• High Energy Neutrinos from Cosmological Gamma-Ray Burst Fireballs
• Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
• Can internal shocks produce the variability in GRBs?
• Shocked by GRB 970228: the afterglow of a cosmological fireball
• Variability in GRBs - A Clue
• GRB after-glow: Supporting the cosmological fireball model, constraining parameters, and making predictions
• The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope
• Radio scintillation of gamma-ray-burst afterglows
• The soft X-ray afterglow of gamma ray bursts, a stringent test for the fireball model
• Possible Evidence for Relativistic Shocks in Gamma-Ray Bursts

Cited by in corpus (5)

• Fundamentals of collisionless shocks for astrophysical application, 2. Relativistic shocks
• The rise and fall of the high-energy afterglow emission of GRB 180720B
• Evolution Patterns of the Peak Energy in the GRB Prompt Emission
• Neutrino conversions in cosmological gamma-ray burst fireballs
• Observational Constraints on the Angular and Spectral Distributions of Photons in Gamma-Ray Burst Sources