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Spectral cutoffs of Fermi-LAT GRBs 080916C and 090926A
Li, Biao1; Li, Zhuo1,2
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2012-11
Volume12Issue:11Pages:1519-1525
DOI10.1088/1674-4527/12/11/006
Indexed BySCI
KeywordGamma-rays: Bursts Acceleration Of Particles
Abstract

It is expected that there should be a spectral cutoff at the high energy end of emission from a prompt gamma-ray burst (GRB), due to, e.g. gamma gamma absorption and/or a high energy cutoff in the electron distribution. We analyze the spectral data of Fermi-LAT detected GRBs 080916C and 090926A, aiming at locating the spectral cutoff. By assuming that the prompt GRB spectrum at the high energy end is a power law with an exponential cutoff, our analysis finds that the cutoff energy E-cutoff depends on the photon index beta and the cutoff occurs at very high energy, E-cutoff = 161(-95)(+533) GeV in GRB 080916C and E-cutoff greater than or similar to 100 GeV (for beta approximate to -2.3) in GRB 090926A. Such high energy photons, if they exist, may disfavor the synchrotron origin and need alternative generation mechanisms.

Funding ProjectOpen Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences
Funding OrganizationOpen Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherNATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
Publication Place20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
ISSN1674-4527
URL查看原文
WOS IDWOS:000311523700006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordGAMMA-RAY BURSTS ; LORENTZ FACTORS ; GEV EMISSION ; RESIDUAL COLLISIONS ; PROMPT ; RADIATION ; AFTERGLOW ; OUTFLOWS ; LIMITS ; BATSE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9428
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Biao
Affiliation1.Department of Astronomy/Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
Recommended Citation
GB/T 7714
Li, Biao,Li, Zhuo. Spectral cutoffs of Fermi-LAT GRBs 080916C and 090926A[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(11):1519-1525.
APA Li, Biao,&Li, Zhuo.(2012).Spectral cutoffs of Fermi-LAT GRBs 080916C and 090926A.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(11),1519-1525.
MLA Li, Biao,et al."Spectral cutoffs of Fermi-LAT GRBs 080916C and 090926A".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.11(2012):1519-1525.
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