Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs

@article{Dichiara2021EvidenceOE,
  title={Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs},
  author={Simone Dichiara and Eleonora Troja and Paz Beniamini and Brendan O’Connor and Michael Moss and A. Y. Lien and Roberto Ricci and Lorenzo Amati and Geoffrey Ryan and Takanori Sakamoto},
  journal={The Astrophysical Journal Letters},
  year={2021},
  volume={911}
}
We study the high-energy properties of GRB 181123B, a short gamma-ray burst (sGRB) at redshift z ≈ 1.75. We show that, despite its nominal short duration with T 90 < 2 s, this burst displays evidence of a temporally extended emission (EE) at high energies and that the same trend is observed in the majority of sGRBs at z ≳ 1. We discuss the impact of instrumental selection effects on the GRB classification, stressing that the measured T 90 is not an unambiguous indicator of the burst physical… 

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