Mao, J. 2011 GRB100219A 的多波段余辉观测

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Title:		Diversity of multiwavelength emission bumps in the GRB 100219A afterglow
Authors:		Mao, J.; Malesani, D.; D'Avanzo, P.; Covino, S.; Li, S.; Jakobsson, P.; Bai, J. M.
Affiliation:		AA(Space Science DivisionKorea Astronomy and Space Science Institute, 776, Daedeokdae-ro, Yuseong-gu, 305-348, Daejeon, Republic of Korea jirongmao@mail.ynao.ac.cn; Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China; INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807, Merate (LC), Italy), AB(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, Copenhagen, Denmark), AC(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807, Merate (LC), Italy), AD(INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807, Merate (LC), Italy), AE(Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China), AF(Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Dunhagi 5, 107, Reykjavik, Iceland), AG(Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, Yunnan Province, PR China)
Publication:		Astronomy & Astrophysics, Volume 538, id.A1 (A&A Homepage)
Publication Date:		02/2012
Origin:		EDP Sciences
Astronomy Keywords:		shock waves, dust, extinction, X-rays: general, gamma rays: general
DOI:		10.1051/0004-6361/201117770
Bibliographic Code:		2012A&A...538A...1M

Abstract

Context. Multi-wavelength observations of gamma-ray burst (GRB) afterglows provide important information about the activity of their central engines and their environments. In particular, the short timescale variability, such as bumps and/or rebrightening features visible in the multi-wavelength light curves, is still poorly understood. 
Aims: We analyze the multi-wavelength observations of the GRB 100219A afterglow at redshift 4.7. In particular, we attempt to identify the physical origin of the late achromatic flares/bumps detected in the X-ray and optical bands. 
Methods: We present ground-based optical photometric data and Swift X-ray observations on GRB 100219A. We analyzed the temporal behavior of the X-ray and optical light curves, as well as the X-ray spectra. 
Results: The early flares in the X-ray and optical light curves peak simultaneously at about 1000 s after the burst trigger, while late achromatic bumps in the X-ray and optical bands appear at about 2 × 10⁴ s after the burst trigger. These are uncommon features in the afterglow phenomenology. Considering the temporal and spectral properties, we argue that both optical and X-ray emissions come from the same mechanism. The late flares/bumps may be produced by late internal shocks from long-lasting activity of the central engine. An off-axis origin for a structured jet model is also discussed to interpret the bump shapes. The early optical bump can be interpreted as the afterglow onset, while the early X-ray flare could be caused by the internal activity. GRB 100219A exploded in a dense environment as revealed by the strong attenuation of X-ray emission and the optical-to-X-ray spectral energy distribution.

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