Expected neutrino fluence from short Gamma-Ray Burst 170817A and off-axis angle constraints

Expected neutrino fluence from short Gamma-Ray Burst 170817A and off-axis angle constraints

Abstract We compute the expected neutrino fluence from SGRB 170817A, associated with the gravitational wave event GW 170817, directly based on Fermi observations in two scenarios: structured jet and off-axis (observed) top-hat jet. While the expected neutrino fluence for the structured jet case is v...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2018-05, Vol.476 (1), p.1191-1197
Hauptverfasser: Biehl, D, Heinze, J, Winter, W
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Heinze, J
Winter, W
description Abstract We compute the expected neutrino fluence from SGRB 170817A, associated with the gravitational wave event GW 170817, directly based on Fermi observations in two scenarios: structured jet and off-axis (observed) top-hat jet. While the expected neutrino fluence for the structured jet case is very small, large off-axis angles imply high radiation densities in the jet, which can enhance the neutrino production efficiency. In the most optimistic allowed scenario, the neutrino fluence can reach only 10−4 of the sensitivity of the neutrino telescopes. We furthermore demonstrate that the fact that gamma-rays can escape limits the baryonic loading (energy in protons versus photons) and the off-axis angle for the internal shock scenario. In particular, for a baryonic loading of 10, the off-axis angle is more strongly constrained by the baryonic loading than by the time delay between the gravitational wave event and the onset of the gamma-ray emission.
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