Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Astrophysical journal. Letters, 2021-04, Vol.911 (2), p.L28

Ort / Verlag

Austin: The American Astronomical Society

Erscheinungsjahr

2021

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Abstract 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.