Rossi 2010 GRB 080928 的多波段和时段的观测和拟合

主要内容:
此暴的特点是暴还没结束，就有了余辉（或者说地面）观测的数据。从而可以得到一个范围非常大的谱1eV--150keV，说是同步辐射可以拟合。

精彩摘抄:

光变，蓝色的是X射线，红色的光学R波段

谱

一些拟合的参数

文章信息:

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Title:		The Swift/Fermi GRB 080928 from 1 eV to 150 keV
Authors:		Rossi, A.; Schulze, S.; Klose, S.; Kann, D. A.; Rau, A.; Krimm, H. A.; Jóhannesson, G.; Panaitescu, A.; Yuan, F.; Ferrero, P.; Krühler, T.; Greiner, J.; Schady, P.; Pandey, S. B.; Amati, L.; Afonso, P. M. J.; Akerlof, C. W.; Arnold, L.; Clemens, C.; Filgas, R.; Hartmann, D. H.; Küpcü Yoldaş, A.; McBreen, S.; McKay, T. A.; Nicuesa Guelbenzu, A.; Olivares, F.; Paciesas, B.; Rykoff, E. S.; Szokoly, G.; Updike, A. C.; Yoldaş, A.
Publication:		eprint arXiv:1007.0383
Publication Date:		07/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		Submitted to A&A, 14 pages, 13 figures, 7 tables; Online Appendix: 3 pages, 1 figure, 4 tables; v2: Fixed LaTeX problem which had made Table A2 disappear, updated Fig. 7
Bibliographic Code:		2010arXiv1007.0383R

Abstract

We present the results of a comprehensive study of the Gamma-Ray Burst 080928 and of its afterglow. GRB 080928 was a long burst detected by Swift/BAT and Fermi/GBM. It is one of the exceptional cases where optical emission was already detected when the GRB itself was still radiating in the gamma-ray band. For nearly 100 seconds simultaneous optical, X-ray and gamma-ray data provide a coverage of the spectral energy distribution of the transient source from about 1 eV to 150 keV. Here we analyze the prompt emission, constrain its spectral properties, and set lower limits on the initial Lorentz factor of the relativistic outflow. In particular, we show that the SED during the main prompt emission phase is in agreement with synchrotron radiation. We construct the optical/near-infrared light curve and the spectral energy distribution based on Swift/UVOT, ROTSE-IIIa (Australia) and GROND (La Silla) data and compare it to the X-ray light curve retrieved from the Swift/XRT repository. We show that its bumpy shape can be modeled by multiple energy injections into the forward shock. Furthermore, we provide evidence that the temporal and spectral evolution of the first strong flare seen in the early X-ray light curve can be explained by large-angle emission. Finally, we report on the results of our search for the GRB host galaxy, for which only a deep upper limit can be provided.

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