Panaitescu 2013 GRB 130427A的外激波模型

主要内容:
用一般的正反激波，星风环境，逆康普顿散射，拟合了它的各波段余辉。

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Title:		An external-shock model for gamma-ray burst afterglow 130427A
Authors:		Panaitescu, A.; Vestrand, W. T.; Woźniak, P.
Affiliation:		AA(Space and Remote Sensing, MS B244, Los Alamos National Laboratory, Los Alamos, NM 87545, USA; alin@lanl.gov), AB(Space and Remote Sensing, MS B244, Los Alamos National Laboratory, Los Alamos, NM 87545, USA), AC(Space and Remote Sensing, MS B244, Los Alamos National Laboratory, Los Alamos, NM 87545, USA)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 4, p.3106-3111 (MNRAS Homepage)
Publication Date:		12/2013
Origin:		OUP
Astronomy Keywords:		radiation mechanisms: non-thermal, relativistic processes, shock waves
Abstract Copyright:		2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:		10.1093/mnras/stt1792
Bibliographic Code:		2013MNRAS.436.3106P

Abstract

The complex multiwavelength emission of gamma-ray burst (GRB) afterglow 130427A (monitored in the radio up to 10 d, in the optical and X-ray until 50 d, and at GeV energies until 1 d) can be accounted for by a hybrid reverse-forward shock synchrotron model, with inverse-Compton emerging only above a few GeV. The high ratio of the early optical to late radio flux requires that the ambient medium is a wind and that the forward-shock synchrotron spectrum peaks in the optical at about 10 ks. The latter has two consequences: the wind must be very tenuous and the optical emission before 10 ks must arise from the reverse-shock, as suggested also by the bright optical flash that Raptor has monitored during the prompt emission phase (<100 s). The Very Large Array radio emission is from the reverse-shock, the Swift X-ray emission is mostly from the forward-shock, but the both shocks give comparable contributions to the Fermi GeV emission. The weak wind implies a large blast-wave radius (8 t_day^{1/2} pc), which requires a very tenuous circumstellar medium, suggesting that the massive stellar progenitor of GRB 130427A resided in a superbubble.

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