2015MNRAS.453.4121O -
Mon. Not. R. Astron. Soc., 453, 4121-4135 (2015/November-2)
Exploring the canonical behaviour of long gamma-ray bursts using an intrinsic multiwavelength afterglow correlation.
OATES S.R., RACUSIN J.L., DE PASQUALE M., PAGE M.J., CASTRO-TIRADO A.J., GOROSABEL J., SMITH P.J., BREEVELD A.A. and KUIN N.P.M.
Abstract (from CDS):
In this paper, we further investigate the relationship, reported by Oates et al., between the optical/UV afterglow luminosity (measured at restframe 200 s) and average afterglow decay rate (measured from restframe 200 s onwards) of long duration gamma-ray bursts (GRBs). We extend the analysis by examining the X-ray light curves, finding a consistent correlation. We therefore explore how the parameters of these correlations relate to the prompt emission phase and, using a Monte Carlo simulation, explore whether these correlations are consistent with predictions of the standard afterglow model. We find significant correlations between: logLO, 200s and logLX, 200s; αO, >200s and αX, >200s, consistent with simulations. The model also predicts relationships between logEiso and logL200s; however, while we find such relationships in the observed sample, the slope of the linear regression is shallower than that simulated and inconsistent at ≳ 3σ. Simulations also do not agree with correlations observed between logL200s and α> 200s, or log E_iso and α> 200s. Overall, these observed 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 all the observed correlations. This leads us to briefly discuss alternative more complex models.
Abstract Copyright:
© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)
Journal keyword(s):
gamma-ray burst: general
Simbad objects:
48
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