Can internal shocks produce the variability in GRBs?

Abstract

We discuss the possibility that gamma-ray bursts result from internal shocks in an ultra-relativistic matter. Using a simple model we calculate the temporal structure and we estimate the efficiency of this process. In this model the ultra-relativistic matter flow is represented by a succession of shells with random values of the Lorentz factor. We calculate the shocks that take place between those shells and we estimate the resulting emission. Internal shocks can produce the highly variable temporal structure observed in most of the bursts provided that the source emitting the relativistic flow is highly variable. The observed peaks are in almost one to one correlation to the activity of the emitting source. A large fraction of the kinetic energy is converted to radiation. The most efficient case is when an inner engine produces shells with comparable energy but very different Lorentz factors. It also gives the most preferable temporal structure.

Submitted to ApJ, 16 pages, latex, 11 figures

Cited by in corpus (379)

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• The GROND GRB sample: II. Fireball parameters for four GRB afterglows
• Low-efficiency long gamma-ray bursts: A case study with AT2020blt
• Radiation-mediated shocks in gamma-ray bursts: spectral evolution
• Numerical simulations of internal shocks in spherical geometry: hydrodynamics and prompt emission
• The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178
• The Double-Burst Nature and Early Afterglow Evolution of Long GRB 110801A
• Variability of magnetically-dominated jets from accreting black holes