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Gamma-Ray Bursts are precise distance indicators similar to Type Ia Supernovae?
Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku +2
We estimate the distance modulus to long gamma-ray bursts (LGRBs) using the Type I Fundamental Plane, a correlation between the spectral peak energy , the peak luminosit…
Identifying Subclasses of Long Gamma-Ray Bursts with Cumulative Light Curve Morphology of Prompt Emissions
Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku +2
We argue a new classification scheme of long gamma-ray bursts (LGRBs) using the morphology of the cumulative light curve of the prompt emission. We parametrize the morphology by th…
The Improved Ep-TL-Lp Diagram and a Robust Regression Method
Ryo Tsutsui, Takashi Nakamura, Daisuke Yonetoku +3
The accuracy and reliability of gamma-ray bursts (GRBs) as distance indicators are strongly restricted by their systematic errors which are larger than statistical errors. These sy…