Melandri, A. 2010 GRB 090313的余辉观测

主要内容:

精彩摘抄:

多波段的光变

光学多波段的光变，有意思的是JHK这几个红外波段没有峰值

谱，不过为什么光变不同的那段没显示出来呢？

一些有光学峰的暴，以及对洛仑兹因子的估计

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Title:		GRB 090313 and the Origin of Optical Peaks in GRB Light Curves: Implications for Lorentz Factors and Radio Flares
Authors:		Melandri, A.; Kobayashi, S.; Mundell, C. G.; Guidorzi, C.; de Ugarte Postigo, A.; Pooley, G.; Yoshida, M.; Bersier, D.;Castro-Tirado, A. J.; Jelinek, M.; Gomboc, A.; Gorosabel, J.; Kubanek, P.; Bremer, M.; Winters, J. M.; Steele, I. A.;Smith, R. J.; de Gregorio-Monsalvo, I.; Garcia-Appadoo, D.; Sota, A.; Lundgren, A.
Publication:		eprint arXiv:1009.4361
Publication Date:		09/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		30 pages, 4 tables, 8 figures, accepted for publication on the Astrophysical Journal
Bibliographic Code:		2010arXiv1009.4361M

Abstract

We use a sample of 19 Gamma Ray Bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time of the onset of the afterglow and the temporal rising index. Our sample includes GRBs and X-ray flashes for which we derive a wide range of initial Lorentz factors ($40 < \Gamma < 450$). Using plausible model parameters the typical frequency of the forward shock is expected to lie close to the optical band; within this low typical frequency framework, we use the optical data to constrain $\epsilon_e$ and show that values derived from the early time light curve properties are consistent with published typical values derived from other afterglow studies. We produce expected radio light curves by predicting the temporal evolution of the expected radio emission from forward and reverse shock components, including synchrotron self-absorption effects at early time. Although a number of the GRBs in this sample do not have published radio measurements, we demonstrate the effectiveness of this method in the case of {\it Swift} GRB 090313, for which millimetric and centrimetric observations were available, and conclude that future detections of reverse-shock radio flares with new radio facilities such as the EVLA and ALMA will test the low frequency model and provide constraints on magnetic models.

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