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- W2755513979 abstract "Short duration GRBs (SGRBs) are widely believed to originate from neutron star mergers and the merger rate can be estimated via the observed GRB rate with the correction of the outflow half-opening angles. The jet breaks in the afterglow lightcurves of SGRBs, rarely detected so far, are crucial for such an approach. In this work we report the detection of jet decline behaviors in the late optical afterglows of GRB 150424A and GRB 160821B and find $theta_{rm j}sim 0.1$ rad. Together with the four events (GRB 051221A, GRB 090426A, GRB 111020A and GRB 130603B) reported before 2015 and the other three identified recently (GRB 050709, GRB 060614 and GRB 140903A), we thus have a sample consisting of nine SGRBs (including one long-short event) with a reasonably estimated $theta_{rm j}$. In particular, three events in the sample are local (i.e., their redshifts are $leq 0.2$), with which we can conservatively estimate the local neutron star merger rate density to be $sim 130~{rm Gpc^{-3}~yr^{-1}}$, and the real value may be $sim 10$ times higher, suggesting a very promising detection prospect of advanced LIGO/Virgo in their full sensitivity runs. Inspired by the typical $theta_{rm j}sim 0.1$ rad found in the current sample, we further investigate whether the off-beam GRBs (in the uniform jet model) or the off-axis events (in the structured jet model) can significantly enhance the GRB/GW association or not. For the former the enhancement is at most moderate, while for the latter the enhancement can be much greater and a high association probability of $sim 10%$ is possible." @default.
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- W2755513979 date "2017-08-23" @default.
- W2755513979 modified "2023-09-27" @default.
- W2755513979 title "Short GRBs with small opening angles: implications on local neutron star merger rate and GRB/GW association" @default.
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