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Exploring the canonical behaviour of long Gamma-Ray Bursts using an intrinsic multi-wavelength afterglow correlation

Oates, SR; Racusin, JL; De Pasquale, M; Kocevski, D; Page, MJ; Castro-Tirado, AJ; Gorosabel, J; ... Smith, PJ; + view all (2023) Exploring the canonical behaviour of long Gamma-Ray Bursts using an intrinsic multi-wavelength afterglow correlation. In: The Sixteenth Marcel Grossmann Meeting. (pp. pp. 3150-3161). World Scientific Green open access

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Abstract

In this conference proceeding we summarise our investigation of a correlation discovered between the afterglow luminosity (measured at restframe 200 s; log L200s) and average afterglow decay rate (measured from restframe 200 s onwards; α>200s) of long duration Gamma-ray Burst (GRB) afterglows, found in both the optical/UV and X-ray afterglows. We examine the correlation in the X-ray light curves and find that it does not depend on the presence of specific features in the X-ray light curve. We test how the optical and X-ray parameters log LO,200s, log LX,200s, αO,>200s, αX,>200s relate to each other and to parameters from the prompt emission phase. Using a Monte Carlo simulation, we explore whether these relationships are consistent with predictions of a basic standard afterglow model. We conclude that most of the correlations we observe are consistent with a common underlying physical mechanism producing GRBs and their afterglows regardless of their detailed temporal behaviour, but this basic model has difficulty explaining correlations involving α>200s. We therefore briefly discuss alternative more complex afterglow models.

Type: Proceedings paper
Title: Exploring the canonical behaviour of long Gamma-Ray Bursts using an intrinsic multi-wavelength afterglow correlation
Event: Proceedings of the MG16 Meeting on General Relativity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1142/9789811269776_0258
Publisher version: http://dx.doi.org/10.1142/9789811269776_0258
Language: English
Additional information: © The Editors© The Editors Open Access volume published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution Non-Commercial 4.0 (CC BY-NC) License.
Keywords: Gamma-ray bursts; correlations
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10193295
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