A comparison between radio loud and quiet gamma-ray bursts, and evidence for a potential correlation between intrinsic duration and redshift in the radio loud population

Nicole M. Lloyd-Ronning, Ben Gompertz, Asaf Pe'Er, Maria Dainotti, Andy Fruchter

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Abstract

We extend our study of energetic radio-loud and-quiet gamma-ray bursts (GRBs), suggesting these GRBs potentially come from two separate progenitor systems. We expand the sample from our previous paper and find that our results are strengthened-radio-quiet GRBs have significantly shorter intrinsic prompt duration, and are also less energetic on average. However, the tenuous correlation between isotropic energy and intrinsic duration in the radio dark sample remains tenuous and is slightly weakened by adding more bursts. Interestingly, we find an anticorrelation between the intrinsic duration and redshift in the radio bright sample but not the radio dark sample, further supporting that these two samples may come from separate progenitors. We also find that very high energy (0.1-100 GeV) extended emission is only present in the radio-loud sample. There is no significant difference between the presence of X-ray/optical plateaus or the average jet opening angles between the two samples. We explore the interpretation of these results in the context of different progenitor models. The data are consistent with the radio-loud GRBs coming from a helium merger system and the radio-quiet GRBs coming from a collapsar system, but may also reflect other dichotomies in the inner engine such as a neutron star versus black hole core.

Original languageEnglish
Article number118
JournalAstrophysical Journal
Volume871
Issue number1
DOIs
StatePublished - 20 Jan 2019

Bibliographical note

Publisher Copyright:
© 2019 The American Astronomical Society. All rights reserved.

Funding

We thank the referee for helpful comments and suggestions that led to an improvement of this manuscript. We also thank Chris Fryer for interesting discussions on progenitor systems. M.D. acknowledges the support of the AAS Chretienne International Fellowship. B.G. has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no 725246, TEDE, PI Levan). Work at LANL was done under the auspices of the National Nuclear Security Administration of the US Department of Energy at Los Alamos National Laboratory LA-UR-18-28535. We also thank Chris Fryer for interesting discussions on progenitor systems. M.D. acknowledges the support of the AAS Chretienne International Fellowship. B.G. has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement no 725246, TEDE, PI Levan). Work at LANL was done under the auspices of the National Nuclear Security Administration of the US Department of Energy at Los Alamos National Laboratory LA-UR-18-28535.

FundersFunder number
Los Alamos National Laboratory
Horizon 2020 Framework Programme773062, 725246
European Commission

    Keywords

    • gamma-ray bursts: General
    • stars: General

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