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Cosmological Constraints from calibrated Yonetoku and Amati relation implies Fundamental plane of Gamma-ray bursts
Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku +3
We consider two empirical relations using data only from the prompt emission of Gamma-Ray Bursts (GRBs), peak energy () - peak luminosity () relation (so called Yonetoku…
Suzaku Observations of SGR 1900+14 and SGR 1806-20
Yujin E. Nakagawa, Tatehiro Mihara, Atsumasa Yoshida +8
Spectral and timing studies of Suzaku ToO observations of two SGRs, 1900+14 and 1806-20, are presented. The X-ray quiescent emission spectra were well fitted by a two blackbody fun…
Constraints on and of Dark Energy from High Redshift Gamma Ray Bursts
Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku +4
We extend the Hubble diagram up to using 63 gamma-ray bursts (GRBs) via peak energy-peak luminosity relation (so called Yonetoku relation), and obtain constraints on cosm…
Gamma-Ray Bursts in Suggest that the Time Variation of the Dark Energy is Small
Yoshiki Kodama, Daisuke Yonetoku, Toshio Murakami +3
We calibrated the peak energy-peak luminosity relation of GRBs (so called Yonetoku relation) using 33 events with the redshift without assuming any cosmological models.…