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arXiv 1201.1292astro-ph.HE
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Swift GRB 080310早期光发射的起源

The origin of the early time optical emission of Swift GRB 080310

O. M. Littlejohns, R. Willingale, P. T. O'Brien, A. P. Beardmore, S. Covino, D. A. Perley, N. R. Tanvir, E. Rol, F. Yuan, C. Akerlof, P. D. Avanzo, D. F. Bersie… 展开作者

O. M. Littlejohns, R. Willingale, P. T. O'Brien, A. P. Beardmore, S. Covino, D. A. Perley, N. R. Tanvir, E. Rol, F. Yuan, C. Akerlof, P. D. Avanzo, D. F. Bersier, A. J. Castro-Tirado, P. Christian, B. E. Cobb, P. A. Evans, A. V. Filippenko, H. Flewelling, D. Fugazza, E. A. Hoversten, A. P. Kamble, S. Kobayashi, W. Li, A. N. Morgan, C. G. Mundell, K. Page, E. Palazzi, R. M. Quimby, S. Schulze, I. A. Steele, A. de Ugarte Postigo

摘要:

我们目前的宽带多波长观测GRB 080310在红移z = 2.43。这次爆发是明亮和长寿的,并且不寻常的是在瞬发阶段有广泛的光学和近红外跟踪。使用这些数据,我们试图同时使用一系列的提示脉冲和余辉组件的伽马射线,X射线,光学和红外发射模型。初步尝试外推的高能量模型直接为每个脉冲的较低的能量显示,光谱中断之间的光学制度和0.3千电子伏,以避免过度预测的光通量。我们表明,余辉发射单独是不足以描述所有的光学和红外数据中看到的形态。允许即时组件主导早期的光学和IR,并允许每个脉冲有一个独立的低能量光谱指数,我们产生一个替代方案,更好地描述了光学光变曲线。然而,这并不能描述GRB 080310早期的光谱形状。即时和余辉为主的模型的拟合统计几乎是相同的,这使得它很难赞成。然而,一个持久的结果是,这两个模型需要一个低的能量谱指数符合自吸收的至少一些脉冲中识别的高能量发射模型。

英文摘要:

We present broadband multi-wavelength observations of GRB 080310 at redshift z = 2.43. This burst was bright and long-lived, and unusual in having extensive optical and near IR follow-up during the prompt phase. Using these data we attempt to simultaneously model the gamma-ray, X-ray, optical and IR emission using a series of prompt pulses and an afterglow component. Initial attempts to extrapolate the high energy model directly to lower energies for each pulse reveal that a spectral break is required between the optical regime and 0.3 keV to avoid over predicting the optical flux. We demonstrate that afterglow emission alone is insufficient to describe all morphology seen in the optical and IR data. Allowing the prompt component to dominate the early-time optical and IR and permitting each pulse to have an independent low energy spectral indices we produce an alternative scenario which better describes the optical light curve. This, however, does not describe the spectral shape of GRB 080310 at early times. The fit statistics for the prompt and afterglow dominated models are nearly identical making it difficult to favour either. However one enduring result is that both models require a low energy spectral index consistent with self absorption for at least some of the pulses identified in the high energy emission model.

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