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GRB radiative efficiencies derived from the swift data: GRBs versus XRFs, long versus short
Zhang, B1; Liang, EW1,2; Page, KL3; Grupe, D4; Zhang BB(张彬彬)1,5; Barthelmy, SD6; Burrows, DN4; Campana, S6; Chincarini, G7,8; Gehrels, N6; Kobayashi, S9; Meszaros, P4,10; Moretti, A7; Nousek, JA4; O'Brien, PT3; Osborne, JP3; Roming, PWA4; Sakamoto, T6; Schady, P4; Willingale, R3; Zhang, B (reprint author), Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA.
Source PublicationASTROPHYSICAL JOURNAL
2007-02-01
Volume655Issue:2Pages:989-1001
DOI10.1086/510110
Contribution Rank第5完成单位
Indexed BySCI
KeywordGamma Rays : Bursts Methods : Statistical Radiation Mechanisms : Nonthermal Shock Waves
AbstractWe systematically analyze the prompt emission and the early afterglow data of a sample of 31 GRBs detected by Swift before 2005 September and estimate the GRB radiative efficiency. BAT's narrow band inhibits a precise determination of the GRB spectral parameters, and we have developed a method to estimate these parameters with the hardness ratio information. The shallow decay component commonly existing in early X-ray afterglows, if interpreted as continuous energy injection in the external shock, suggests that the GRB efficiencies previously derived from the late-time X-ray data were not reliable. We calculate two radiative efficiencies using the afterglow kinetic energy E(K) derived at the putative deceleration time (t(dec)) and at the break time (t(b)), when the energy injection phase ends, respectively. At tb XRFs appear to be less efficient than normal GRBs. However, when we analyze the data at tdec, XRFs are found to be as efficient as GRBs. Short GRBs have similar radiative efficiencies to long GRBs despite of their different progenitors. Twenty-two bursts in the sample are identified to have the afterglow cooling frequency below the X-ray band. Assuming epsilon(e) 0:1, we find eta(gamma)(t(b)) usually < 10% and eta(gamma)(t(dec)) varying from a few percent to > 90%. Nine GRBs in the sample have the afterglow cooling frequency above the X-ray band for a very long time. This suggests a very small epsilon(B) and/or a very low ambient density n.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeReview
ISSN0004-637X
URL查看原文
WOS IDWOS:000243726000027
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGAMMA-RAY-BURSTS ; AFTERGLOW LIGHT CURVES ; CONTINUOUS ENERGY INJECTION ; INTERNAL-SHOCK MODEL ; PHYSICAL PARAMETERS ; MILLISECOND PULSARS ; 2-COMPONENT JET ; ALERT TELESCOPE ; FIREBALL MODEL ; KINETIC-ENERGY
Citation statistics
Cited Times:168[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7027
Collection星系研究组
Corresponding AuthorZhang, B (reprint author), Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA.
Affiliation1.Department of Physics, University of Nevada, Las Vegas, NV
2.Department of Physics, Guangxi University, Nanning, China
3.Department of Physics and Astronomy, University of Leicester, Leicester, UK
4.Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA
5.National Astronomical Observatory/Yunnan Observatory, Chinese Academy of Sciences, Kunming, China
6.NASA/Goddard Space Flight Center, Greenbelt, MD
7.INAF-Osservatorio Astronomico di Brera, Merate, Italy
8.Dipartmento di Fisica, Univeritá degli studi Milano-Bicocca, Milan, Italy
9.Astrophysics Research Institute, Liverpool John Moores University, Birkenhead, UK
10.Department of Physics, Pennsylvania State University, University Park, PA
Recommended Citation
GB/T 7714
Zhang, B,Liang, EW,Page, KL,et al. GRB radiative efficiencies derived from the swift data: GRBs versus XRFs, long versus short[J]. ASTROPHYSICAL JOURNAL,2007,655(2):989-1001.
APA Zhang, B.,Liang, EW.,Page, KL.,Grupe, D.,Zhang BB.,...&Zhang, B .(2007).GRB radiative efficiencies derived from the swift data: GRBs versus XRFs, long versus short.ASTROPHYSICAL JOURNAL,655(2),989-1001.
MLA Zhang, B,et al."GRB radiative efficiencies derived from the swift data: GRBs versus XRFs, long versus short".ASTROPHYSICAL JOURNAL 655.2(2007):989-1001.
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