Exploring the canonical behaviour of long gamma-ray bursts with an intrinsic multiwavelength afterglow correlation
S. Oates*, J.L. Racusin, M. De Pasquale, D. Kocevski, M.J. Page, A.J. Castro-Tirado, J. Gorosabel, A.A. Breeveld, N.P. Kuin and P.J. Smith
Pre-published on:
November 23, 2020
Published on:
December 03, 2020
Abstract
In this conference proceeding we examine a correlation between the afterglow luminosity (measured at restframe 200 s; $\rm log\;L_{200\rm{s}}$) and average afterglow decay rate (measured from restframe 200 s onwards; $\alpha_{>200\rm{s}}$) 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 $\alpha_{>200\rm{s}}$. We therefore briefly discuss alternative more complex models.
DOI: https://doi.org/10.22323/1.362.0058
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