The early and late-time spectral and temporal evolution of GRB 050716

E. Rol; J. P. Osborne; K. L. Page; K. E. McGowan; A. P. Beardmore; P. T . O'Brien; A. J. Levan; D. Bersier; C. Guidorzi; F. Marshall; A. S. Fruchter; N. R. Tanvir; A. Monfardini; A. Gomboc; S. Barthelmy; N. P. Bannister

doi:10.1111/j.1365-2966.2006.11224.x

arXiv · astro-ph/0611554

The early and late-time spectral and temporal evolution of GRB 050716

E. Rol·J. P. Osborne·K. L. Page·K. E. McGowan·A. P. Beardmore·P. T . O'Brien·A. J. Levan·D. Bersier·C. Guidorzi·F. Marshall·A. S. Fruchter·N. R. Tanvir·A. Monfardini·A. Gomboc·S. Barthelmy·N. P. Bannister

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Abstract

We report on a comprehensive set of observations of Gamma Ray Burst 050716, detected by the Swift satellite and subsequently followed-up rapidly in X-ray, optical and near infra-red wavebands. The prompt emission is typical of long-duration bursts, with two peaks in a time interval of T90 = 68 seconds (15 - 350 keV). The prompt emission continues at lower flux levels in the X-ray band, where several smaller flares can be seen, on top of a decaying light curve that exhibits an apparent break around 220 seconds post trigger. This temporal break is roughly coincident with a spectral break. The latter can be related to the extrapolated evolution of the break energy in the prompt gamma-ray emission, and is possibly the manifestation of the peak flux break frequency of the internal shock passing through the observing band. A possible 3 sigma change in the X-ray absorption column is also seen during this time. The late-time afterglow behaviour is relatively standard, with an electron distribution power-law index of p = 2 there is no noticable temporal break out to at least 10 days. The broad-band optical/nIR to X-ray spectrum indicates a redshift of z ~> 2 for this burst, with a host-galaxy extinction value of E(B-V) ~ 0.7 that prefers an SMC-like extinction curve.

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E. Rol, J. P. Osborne, K. L. Page, K. E. McGowan, A. P. Beardmore, P. T . O'Brien, A. J. Levan, D. Bersier, C. Guidorzi, F. Marshall, A. S. Fruchter, N. R. Tanvir, A. Monfardini, A. Gomboc, S. Barthelmy, N. P. Bannister. 2006-11-17. The early and late-time spectral and temporal evolution of GRB 050716. https://doi.org/10.1111/j.1365-2966.2006.11224.x

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