Short-duration gamma-ray bursts from off-axis collapsars

Details Short-duration gamma-ray bursts from off-axis collapsars Short-duration gamma-ray bursts from off-axis collapsars

2009-11-17

arxiv.org/abs/0911.3313v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 6 color figures, accepted for publication in ApJ, main journal

Scientific paper

We present 2D high-resolution hydrodynamic simulations of the relativistic outflows of long-duration gamma-ray burst progenitors. We analyze the properties of the outflows at wide off-axis angles, produced by the expansion of the hot cocoon that surrounds the jet inside the progenitor star. We find that the cocoon emission at wide angles may have properties similar to those of the subclass of short-duration gamma-ray bursts with persistent X-ray emission. We compute the predicted duration distribution, redshift distribution, and afterglow brightness and we find that they are all in agreement with the observed properties of short GRBs with persistent emission. We suggest that a SN component, the properties of the host galaxies, and late afterglow observations can be used as a crucial test to verify this model.

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