The Ultraviolet flash accompanying GRBs from neutron-rich internal shocks

Details The Ultraviolet flash accompanying GRBs from neutron-rich internal shocks The Ultraviolet flash accompanying GRBs from neutron-rich internal shocks

2004-10-05

arxiv.org/abs/astro-ph/0410125v2

Astrophys.J. 615 (2004) L69-L72

Astronomy and Astrophysics

Astrophysics

6 pages (2 eps figures), accepted for publication in ApJL

Scientific paper

10.1086/426476

In the neutron-rich internal shocks model for Gamma-ray Burts (GRBs), the Lorentz factors (LFs) of ions shells are variable, so are the LFs of accompanying neutron shells. For slow neutron shells with a typical LF tens, the typical beta-decay radius reads R_{\beta,s} several 10^{14} cm, which is much larger than the typical internal shocks radius 10^{13} cm, so their impact on the internal shocks may be unimportant. However, as GRBs last long enough (T_{90}>20(1+z) s), one earlier but slower ejected neutron shell will be swept successively by later ejected ion shells in the range 10^{13}-10^{15} cm, where slow neutrons have decayed significantly. We show in this work that ion shells interacting with the beta-decay products of slow neutron shells can power a ultraviolet (UV) flash bright to 12th magnitude during the prompt gamma-ray emission phase or slightly delayed, which can be detected by the upcoming Satellite SWIFT in the near future.

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