87 citations · 212 across the 7 of their papers we have counts for
22 papers · 1 filter
Prior Emission Model for X-ray Plateau Phase of Gamma-Ray Burst Afterglows
Ryo Yamazaki
The two-component emission model to explain the plateau phase of the X-ray afterglows of gamma-ray bursts (GRBs) is proposed. One component, which is responsible for the plateau an…
Two-dimensional full particle simulation of a perpendicular collisionless shock with a shock-rest-frame model
Takayuki Umeda, Masahiro Yamao, Ryo Yamazaki
A two-dimensional (2D) shock-rest-frame model for particle simulations is developed. Then full kinetic dynamics of a perpendicular collisionless shock is examined by means of a 2D…
Testing the External Shock Model of Gamma-Ray Bursts using the Late-Time Simultaneous Optical and X-ray Afterglows
Yuji Urata, Ryo Yamazaki, Takanori Sakamoto +21
We study the ``normal'' decay phase of the X-ray afterglows of gamma-ray bursts (GRBs), which follows the shallow decay phase, using the events simultaneously observed in the R-ban…
Nonthermal Emission Associated with Strong AGN Outbursts at the Centers of Galaxy Clusters
Yutaka Fujita, Kazunori Kohri, Ryo Yamazaki +1
Recently, strong AGN outbursts at the centers of galaxy clusters have been found. Using a simple model, we study particle acceleration around a shock excited by an outburst and est…
Probing the Structure of Gamma-Ray Burst Jets with Steep Decay Phase of their Early X-ray Afterglows
Kentaro Takami, Ryo Yamazaki, Takanori Sakamoto +1
We show that the jet structure of gamma-ray bursts (GRBs) can be investigated with the tail emission of the prompt GRB. The tail emission which we consider is identified as a steep…
A Unified Model of the Prompt Optical Emission of Gamma-Ray Bursts
Hirotsugu Doi, Kentaro Takami, Ryo Yamazaki
The observational diversity of optical emission, which coincides with prompt gamma-ray bursts (GRBs), has been discovered in the recent Swift era. We show that on the assumption of…