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

S. Dichiara, E. Troja, P. Beniamini, B. O'Connor, M. Moss, A. Y. Lien, R. Ricci, L. Amati, G. Ryan, T. Sakamoto

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17 Scopus citations


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 origin. By examining their environment (e.g., stellar mass, star formation, offset distribution), we find that these high-z sGRBs share many properties of long GRBs at a similar distance and are consistent with a short-lived progenitor system. If produced by compact binary mergers, these sGRBs with EE may be easier to localize at large distances and herald a larger population of sGRBs in the early universe.

Original languageEnglish (US)
Article numberL28
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Apr 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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