1307.7596 (Soebur Razzaque)

Long-lived PeV-EeV Neutrinos from GRB Blastwave    [PDF]

Soebur Razzaque

Long duration gamma-ray bursts are powerful sources that can accelerate particles to ultra-high energies. Acceleration of protons in the forward shock of the highly relativistic GRB blastwave allows PeV--EeV neutrino production by photopion interactions of ultra-high energy protons with X-ray to optical photons of the GRB afterglow emission. Four different blastwave evolution scenarios are considered: adiabatic and fully radiative blastwaves in a constant density circumburst medium and in a wind environment with its density decreasing inversley proportional with the square of the radius from the center of the burst. The duration of the neutrino flux depends on the evolution of the blastwave, and can last up to a day in case of an adibatic blastwave in a constant density medium. Neutrino fluxes from the three other blastwave evolution scenarios are also calculated. Diffuse neutrino fluxes calculated using the observed rate of long-duration GRBs are consistent with the recent IceCube limit on GRB neutrino flux, and could be consistent with the two events at PeV energies in rather optimisitic cases. Upcoming huge radio Askaryan experiments will be able to probe the flux models presented here or constrain GRB properties.

View original: http://arxiv.org/abs/1307.7596