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titleTiming and Spectral Properties of Bright Hard GRBs Observed by Suzaku-WAM
Author(jpn)杉田, 聡司; 吉田, 篤正; 田代, 信; 大野, 雅功
Author(eng)Sugita, Satoshi; Yoshida, Atsumasa; Tashiro, Makoto; Ohno, Masanori; Suzaku/WAM team and HETE-2 team
Author Affiliation(jpn)名古屋大学エコトピア科学研究所; 名古屋大学エコトピア科学研究所; 理化学研究所; 宇宙航空研究開発機構宇宙科学研究本部
Author Affiliation(eng)EcoTopia Science Institute, Nagoya University; EcoTopia Science Institute, Nagoya University; Institute of Physical and Chemical Research (RIKEN); Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA); Suzaku/WAM team and HETE-2 team
Issue Date2010-02-26
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構特別資料:
JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H
Start page18
End page21
Publication date2010-02-26
AbstractWe report on a detailed comparison between short GRBs and spikes of long GRBs in timing and spectral properties using bright GRBs observed by Suzaku-WAM. We first performed spectral time lag analysis of 217 spikes in 102 bright GRBs. We found a clear proportional correlation between hard/soft lags and widths of spikes for long GRBs, which is smoothly connected with those of short GRBs. We next performed spike-resolved spectral analysis of 63 spikes for 12 long GRBs with known redshifts, using Suzaku-WAM, Swift-BAT, and HETE-2 data. We found a clear correlation between the intrinsic peak energy (E(sub p)) and the isotropic radiated luminosity (L(sub iso)) for individual spikes, E(sub p) is propotional to L(sub iso)(exp 1/2) , over four orders of magnitude of luminosity. Remarkably, E(sub p) and L(sub iso) in 6 short GRBs with known redshifts were also within statistical errors of the relation for long GRBs. From these two results, we conclude that, in our sample, there is no clear differences between short GRBs and spikes of long GRBs in the time lag and the E(sub p)- L(sub iso) relation.
DescriptionMeeting Information: The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan
Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science
KeywordsGamma Ray Burst, WAM, Swift, HETE-2
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-09-008E

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