Emission lines in GRBs constrain the total energy reservoir

Details Emission lines in GRBs constrain the total energy reservoir Emission lines in GRBs constrain the total energy reservoir

2002-05-15

arxiv.org/abs/astro-ph/0205227v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A (Letters)

Scientific paper

10.1051/0004-6361:20020702

The emission features observed in the X-ray afterglow of Gamma Ray Bursts are extremely powerful. Since they last at least for several hours, they imply energies of the order of 1e49 ergs. This in turn implies that the energy contained in the illuminating continuum thought to be responsible of the line production must exceed 1e51 ergs. This is a strong lower limit to the energy reservoir of Gamma Ray Bursts, which is independent of collimation and beaming, and bears important consequences on the possible collimation of the fireball radiation and the density of the medium surrounding the burst.

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