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Title: On the Lack of a Radio Afterglow from Some Gamma-Ray Bursts - Insight into Their Progenitors?

We investigate the intrinsic properties of a sample of bright (with isotropic equivalent energy Eiso > 10 52 erg) gamma-ray bursts (GRBs), comparing those with and without radio afterglow. We find that the sample of bursts with no radio afterglows has a significantly shorter mean intrinsic duration of the prompt gamma-ray radiation, and the distribution of this duration is significantly different from those bursts with a radio afterglow. Although the sample with no radio afterglow has on average lower isotropic energy, the lack of radio afterglow does not appear to be a result of simply energetics of the burst, but a reflection of a separate physical phenomenon likely related to the circumburst density profile. We also find a weak correlation between the isotropic gamma-ray energy and intrinsic duration in the sample with no radio afterglow, but not in the sample that have observed radio afterglows. We give possible explanations for why there may exist a sample of GRBs with no radio afterglow depending on whether the radio emission comes from the forward or reverse shock, and why these bursts appear to have intrinsically shorter prompt emission durations. Lastly, we discuss how our results may have implications for progenitor models ofmore » GRBs.« less
Authors:
 [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-27152
Journal ID: ISSN 0035-8711; TRN: US1702459
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 467; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy and Astrophysics
OSTI Identifier:
1361482

Lloyd-Ronning, Nicole Marie, and Fryer, Christopher L. On the Lack of a Radio Afterglow from Some Gamma-Ray Bursts - Insight into Their Progenitors?. United States: N. p., Web. doi:10.1093/mnras/stx313.
Lloyd-Ronning, Nicole Marie, & Fryer, Christopher L. On the Lack of a Radio Afterglow from Some Gamma-Ray Bursts - Insight into Their Progenitors?. United States. doi:10.1093/mnras/stx313.
Lloyd-Ronning, Nicole Marie, and Fryer, Christopher L. 2017. "On the Lack of a Radio Afterglow from Some Gamma-Ray Bursts - Insight into Their Progenitors?". United States. doi:10.1093/mnras/stx313. https://www.osti.gov/servlets/purl/1361482.
@article{osti_1361482,
title = {On the Lack of a Radio Afterglow from Some Gamma-Ray Bursts - Insight into Their Progenitors?},
author = {Lloyd-Ronning, Nicole Marie and Fryer, Christopher L.},
abstractNote = {We investigate the intrinsic properties of a sample of bright (with isotropic equivalent energy Eiso > 1052 erg) gamma-ray bursts (GRBs), comparing those with and without radio afterglow. We find that the sample of bursts with no radio afterglows has a significantly shorter mean intrinsic duration of the prompt gamma-ray radiation, and the distribution of this duration is significantly different from those bursts with a radio afterglow. Although the sample with no radio afterglow has on average lower isotropic energy, the lack of radio afterglow does not appear to be a result of simply energetics of the burst, but a reflection of a separate physical phenomenon likely related to the circumburst density profile. We also find a weak correlation between the isotropic gamma-ray energy and intrinsic duration in the sample with no radio afterglow, but not in the sample that have observed radio afterglows. We give possible explanations for why there may exist a sample of GRBs with no radio afterglow depending on whether the radio emission comes from the forward or reverse shock, and why these bursts appear to have intrinsically shorter prompt emission durations. Lastly, we discuss how our results may have implications for progenitor models of GRBs.},
doi = {10.1093/mnras/stx313},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 467,
place = {United States},
year = {2017},
month = {2}
}