Oates, SR;
Racusin, JL;
De Pasquale, M;
Page, MJ;
Castro-Tirado, AJ;
Gorosabel, J;
Smith, PJ;
... Kuin, NPM; + view all
(2015)
Exploring the canonical behaviour of long gamma-ray bursts using an intrinsic multiwavelength afterglow correlation.
Monthly Notices of the Royal Astronomical Society (MNRAS)
, 453
(4)
pp. 4121-4135.
10.1093/mnras/stv1956.
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Abstract
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: log LO, 200 s and log LX, 200 s; αO, >200 s and αX, >200 s, consistent with simulations. The model also predicts relationships between log Eiso and log L200 s; 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 log L200 s and α> 200 s, or logEiso logEiso and α> 200 s. 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.
| Type: | Article |
|---|---|
| Title: | Exploring the canonical behaviour of long gamma-ray bursts using an intrinsic multiwavelength afterglow correlation |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stv1956 |
| Publisher version: | https://doi.org/10.1093/mnras/stv1956 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, gamma-ray burst: general, 1ST 2 YEARS, LIGHT CURVES, OPTICAL AFTERGLOWS, LINEAR-REGRESSION, COLUMN DENSITIES, SPECTRAL CATALOG, ALERT TELESCOPE, COMPLETE SAMPLE, CENTRAL ENGINE, HOST GALAXIES |
| 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/1499602 |
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