The Energy of Long-Duration Gamma-Ray Bursts

Details The Energy of Long-Duration Gamma-Ray Bursts The Energy of Long-Duration Gamma-Ray Bursts

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...560l.167p&link_type=abstract

The Astrophysical Journal, Volume 560, Issue 2, pp. L167-L169.

Astronomy and Astrophysics

Astronomy

62

Gamma Rays: Bursts, Ism: Jets And Outflows, Radiation Mechanisms: Nonthermal, Shock Waves

Scientific paper

The energy release in gamma-ray bursts (GRBs) is one of the most useful clues to the nature of their ``inner engines.'' We show that within the framework of the relativistic external shock afterglow model, the narrowness of the observed X-ray flux of GRB afterglows implies that the energy of the GRB jets, after the early-afterglow phase, spans less than 1 order of magnitude. This result is not affected by uncertainties in the electron energy, magnetic field strength, or external medium density. We argue that the afterglow kinetic energy is within a factor of 2 of the initial energy in the relativistic ejecta; therefore, the energy output of the central engine of a long-duration GRB has a universal value.

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