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|Title:||The X-ray, optical and radio evolution of the GRB 030329 afterglow and the associated SN2003dh|
Osborne, J. P.
O'Brien, P. T.
Ward, M. J.
Page, K. L.
|Publisher:||Oxford University Press (OUP), Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2004, 349 (1), pp. 31-38|
|Abstract:||Extensive X-ray, optical and radio observations of the bright afterglow of the gamma-ray burst GRB 030329 are used to construct the multifrequency evolution the event. The data are fitted using the standard fireball shock model to provide estimates of the initial energy, ε = 6.8 × 1052 erg sr−1, the density of the ambient medium, n0 = 1 cm−3, the electron and magnetic energy density fractions, e = 0.24 and B = 0.0017, the power-law index of the relativistic electron spectrum, p = 2.25, and the opening angle of the jet, θ j = 3◦. Deviations from the standard model seen in the optical and radio are most likely attributable to the concurrent hypernova SN2003dh. Peaks at 0.23 and 1.7 d in the R-band are much brighter than expected from a standard supernova (SN), and there is a large radio excess over the expected afterglow flux for t > 2 d. No deviation from the best-fitting afterglow model is seen in the X-ray decline, indicating that the excess optical and radio flux from 1–5 d arises from a later injection of slower electrons by the central engine.|
|Rights:||Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/ Archived with reference to SHERPA/RoMEO and publisher website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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