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Prompt emission from the counter jet of a short gamma-ray burst
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
The counter jet of a short gamma-ray burst (sGRB) has not yet been observed, while recent discoveries of gravitational waves (GWs) from a binary neutron star (NS) merger GW170817 a…
Scattered Short Gamma-Ray Bursts as Electromagnetic Counterparts to Gravitational Waves and Implications of GW170817 and GRB 170817A
Shota Kisaka, Kunihito Ioka, Kazumi Kashiyama +1
In the faint short gamma-ray burst sGRB 170817A followed by the gravitational waves (GWs) from a merger of two neutron stars (NSs) GW170817, the spectral peak energy is too high to…
Can an Off-axis Gamma-Ray Burst Jet in GW170817 Explain All the Electromagnetic Counterparts?
Kunihito Ioka, Takashi Nakamura
Gravitational waves from a merger of two neutron stars (NSs) were discovered for the first time in GW170817, together with diverse electromagnetic (EM) counterparts. To make constr…
Pre-DECIGO can get the smoking gun to decide the astrophysical or cosmological origin of GW150914-like binary black holes
Takashi Nakamura, Masaki Ando, Tomoya Kinugawa +9
Pre-DECIGO consists of three spacecraft arranged in an equilateral triangle with 100km arm lengths orbiting 2000km above the surface of the earth. It is hoped that the launch date…
The detection of Quasinormal Mode of Pop III Binary Black Hole merger with final and would confirm the strong gravity space-time around which is only times the event horizon radius
Takashi Nakamura, Hiroyuki Nakano, Takahiro Tanaka
Recent population synthesis simulations of Pop III stars suggest that the event rate of coalescence of -- binary black holes can be high enough for the d…
Isotropic Detectable X-ray Counterparts to Gravitational Waves from Neutron Star Binary Mergers
Shota Kisaka, Kunihito Ioka, Takashi Nakamura
Neutron star binary mergers are strong sources of gravitational waves (GWs). Promising electromagnetic counterparts are short gamma-ray bursts (GRBs) but the emission is highly col…
Can direct collapse black holes launch gamma-ray bursts and grow to supermassive black holes?
Tatsuya Matsumoto, Daisuke Nakauchi, Kunihito Ioka +2
The existence of black holes (BHs) of mass ~ 10^{9} M_sun at z > 6 is a big puzzle in astrophysics because even optimistic estimates of the accretion time are insufficient for stel…
X-raying extended emission and rapid decay of short gamma-ray bursts
Yasuaki Kagawa, Daisuke Yonetoku, Tatsuya Sawano +5
Extended emission is a mystery in short gamma-ray bursts (SGRBs). By making time resolved spectral analyses of brightest nine events observed by XRT, we obviously cla…
Long Duration X-Ray Flash and X-Ray Rich Gamma Ray Burst from Low Mass Population III Star
Daisuke Nakauchi, Yudai Suwa, Takanori Sakamoto +2
Recent numerical simulations suggest that Population III (Pop III) stars were born with masses not larger than but typically . By self-consis…