GRB 081028 and its late-time afterglow re-brightening

	GRB 081028 and its late-time afterglow re-brightening
	Margutti, R 1,2; Genet, F 3; Granot, J 3; Duran, RB 4; Guidorzi, C 2,5; Chincarini, G 1,2; Mao JR(毛基荣)2,6; Schady, P 7; Sakamoto, T 8; Miller, AA 9
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2010-02-11
卷号	402 期号:1 页码:46-64
关键词	radiation mechanisms: non-thermal gamma-rays: bursts X-rays: individual: GRB 081028
ISSN号	0035-8711
通讯作者	Margutti, R (reprint author), Univ Milano Bicocca, Pza Sci 3, I-20126 Milan, Italy.
产权排序	第六完成单位
英文摘要	Swift captured for the first time a smoothly rising X-ray re-brightening of clear non-flaring origin after the steep decay in a long gamma-ray burst (GRB): GRB 081028. A rising phase is likely present in all GRBs but is usually hidden by the prompt tail emission and constitutes the first manifestation of what is later to give rise to the shallow decay phase. Contemporaneous optical observations reveal a rapid evolution of the injection frequency of a fast cooling synchrotron spectrum through the optical band, which disfavours the afterglow onset (start of the forward shock emission along our line of sight when the outflow is decelerated) as the origin of the observed re-brightening. We investigate alternative scenarios and find that the observations are consistent with the predictions for a narrow jet viewed off-axis. The high on-axis energy budget implied by this interpretation suggests different physical origins of the prompt and (late) afterglow emission. Strong spectral softening takes place from the prompt to the steep decay phase: we track the evolution of the spectral peak energy from the gamma-rays to the X-rays and highlight the problems of the high latitude and adiabatic cooling interpretations. Notably, a softening of both the high and low spectral slopes with time is also observed. We discuss the low on-axis radiative efficiency of GRB 081028 comparing its properties against a sample of Swift long GRBs with secure E(gamma,iso) measurements.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURST ; SWIFT XRT DATA ; 28 FEBRUARY 1997 ; LIGHT CURVES ; E-P,E-I-E-ISO CORRELATION ; THEORETICAL IMPLICATIONS ; LUMINOSITY CORRELATION ; COMPREHENSIVE ANALYSIS ; SPECTRAL EVOLUTION ; REFRESHED SHOCKS
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/402/1/46
语种	英语
WOS记录号	WOS:000274453500006
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4997]
专题	云南天文台_高能天体物理研究组
作者单位	1.Università degli studi Milano Bicocca, P.za della Scienza 3, Milano 20126, Italy 2.INAF Osservatorio Astronomico di Brera, via Bianchi 46, Merate 23807, Italy 3.Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB 4.Department of Physics, University of Texas at Austin, Austin, TX 78712, USA 5.Dipartimento di Fisica, Università di Ferrara, via Saragat 1, 44100 Ferrara, Italy 6.Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, China 7.The UCL Mullard Space Science Laboratory, Holmbury St Mary, Dorking, Surrey RH5 6NT 8.NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 9.Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA 10.Stockholm Observatory, Stockholm University, Astronomy Department AlbaNova Research Center, 106 91 Stockholm, Sweden
推荐引用方式 GB/T 7714	Margutti, R,Genet, F,Granot, J,et al. GRB 081028 and its late-time afterglow re-brightening[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2010,402(1):46-64.
APA	Margutti, R.,Genet, F.,Granot, J.,Duran, RB.,Guidorzi, C.,...&Gehrels, N.(2010).GRB 081028 and its late-time afterglow re-brightening.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,402(1),46-64.
MLA	Margutti, R,et al."GRB 081028 and its late-time afterglow re-brightening".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 402.1(2010):46-64.