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Exploring the canonical behaviour of long gamma-ray bursts with an intrinsic multiwavelength afterglow correlation

Oates, S; Racusin, JL; De Pasquale, M; Kocevski, D; Page, MJ; Castro-Tirado, AJ; Gorosabel, J; ... Smith, PJ; + view all (2020) Exploring the canonical behaviour of long gamma-ray bursts with an intrinsic multiwavelength afterglow correlation. In: Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019). Sissa Medialab: Palermo, Italy. Green open access

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Abstract

In this conference proceeding we examine a correlation between the afterglow luminosity (measured at restframe 200 s; logL200s) and average afterglow decay rate (measured from restframe 200 s onwards; α>200s) found in both the optical/UV and X-ray afterglows of long duration Gamma-ray Bursts (GRBs). Examining the X-ray light curves, we find the correlation does not depend on the presence of specific light curve features. We explore how the parameters in the optical/UV and X-ray bands relate to each other and to the prompt emission phase. We also use a Monte Carlo simulation to explore whether these relationships are consistent with predictions of the standard afterglow model. We conclude that the correlations are consistent with a common underlying physical mechanism producing GRBs and their afterglows regardless of their detailed temporal behaviour. However, a basic afterglow model has difficulty explaining correlations involving α>200s. We therefore briefly discuss alternative more complex models.

Type: Proceedings paper
Title: Exploring the canonical behaviour of long gamma-ray bursts with an intrinsic multiwavelength afterglow correlation
Event: Multifrequency Behaviour of High Energy Cosmic Sources - XIII
Dates: 03 June 2019
Open access status: An open access version is available from UCL Discovery
DOI: 10.22323/1.362.0058
Publisher version: https://doi.org/10.22323/1.362.0058
Language: English
Additional information: Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. https://creativecommons.org/licenses/by-nc-nd/4.0/
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/10118626
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