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

Dichiara, S. and Troja, E. and Beniamini, P. and O’Connor, B. and Moss, M. and Lien, A. Y. and Ricci, R. and Amati, L. and Ryan, G. and Sakamoto, T. (2021) Evidence of Extended Emission in GRB 181123B and Other High-redshift Short GRBs. Astrophysical Journal Letters, 911 (2). Art. No. L28. ISSN 2041-8205. doi:10.3847/2041-8213/abf562.

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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 T₉₀ < 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 T₉₀ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Dichiara, S.0000-0001-6849-1270
Troja, E.0000-0002-1869-7817
Beniamini, P.0000-0001-7833-1043
O’Connor, B.0000-0002-9700-0036
Moss, M.0000-0002-1103-7082
Lien, A. Y.0000-0002-7851-9756
Ricci, R.0000-0003-4631-1528
Amati, L.0000-0001-5355-7388
Ryan, G.0000-0001-9068-7157
Sakamoto, T.0000-0001-6276-6616
Additional Information:© 2021. The American Astronomical Society. Received 2021 February 26; revised 2021 March 25; accepted 2021 April 3; published 2021 April 22. This work was supported in part by the National Aeronautics and Space Administration through grant 80NSSC18K0429 issued through the Astrophysics Data Analysis Program. The research of P.B. was funded by the Gordon and Betty Moore Foundation through grant GBMF5076. Based on observations obtained at the international Gemini Observatory (PI: Troja), a program of NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation on behalf of the Gemini Observatory partnership. This publication made use of data products supplied by the UK Swift Science Data Centre at the University of Leicester.
Errata:S. Dichiara et al 2022 ApJL 934 L16
Funding AgencyGrant Number
Gordon and Betty Moore FoundationGBMF5076
Subject Keywords:Gamma-ray bursts; Neutron stars; Nucleosynthesis; Chemical abundances; Gravitational waves
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Gamma-ray bursts (629); Neutron stars (1108); Nucleosynthesis (1131); Chemical abundances (224); Gravitational waves (678)
Record Number:CaltechAUTHORS:20210503-115704847
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Official Citation:S. Dichiara et al 2021 ApJL 911 L28
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108937
Deposited By: George Porter
Deposited On:03 May 2021 22:29
Last Modified:02 Aug 2022 16:54

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