TY - JOUR
T1 - Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs
AU - Dichiara, S.
AU - Troja, E.
AU - Beniamini, P.
AU - O'Connor, B.
AU - Moss, M.
AU - Lien, A. Y.
AU - Ricci, R.
AU - Amati, L.
AU - Ryan, G.
AU - Sakamoto, T.
N1 - Publisher Copyright:
© 2021. The American Astronomical Society. All rights reserved..
PY - 2021/4/1
Y1 - 2021/4/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85105102639&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/abf562
DO - 10.3847/2041-8213/abf562
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AN - SCOPUS:85105102639
SN - 2041-8205
VL - 911
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L28
ER -