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Magnetic Structures in Gamma-Ray Burst Jets Probed by Gamma-Ray Polarization
Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji +10
We report polarization measurements in two prompt emissions of gamma-ray bursts, GRB 110301A and GRB 110721A, observed with the Gamma-ray burst polarimeter (GAP) aboard IKAROS sola…
Strict Limit on CPT Violation from Polarization of Gamma-Ray Bursts
Kenji Toma, Shinji Mukohyama, Daisuke Yonetoku +9
We report the strictest observational verification of CPT invariance in the photon sector, as a result of gamma-ray polarization measurement of distant gamma-ray bursts (GRBs), whi…
Slow and Fast Transitions in the Rising Phase of Outbursts from NS-LMXB transients, AqlX-1 and 4U1608-52
Kazumi Asai, Masaru Matsuoka, Tatehiro Mihara +6
We analyzed the initial rising behaviors of X-ray outbursts from two transient low-mass X-ray binaries (LMXBs) containing a neutron-star (NS), Aql X-1 and 4U 1608-52, which are con…
Possible Detection of an Emission Cyclotron Resonance Scattering Feature from the Accretion-powered Pulsar 4U 1626-67
W. B. Iwakiri, Y. Terada, T. Mihara +7
We present analysis of 4U 1626-67, a 7.7 s pulsar in a low-mass X-ray binary system, observed with the hard X-ray detector of the Japanese X-ray satellite Suzaku in March 2006 for…
Superburst with Outburst from EXO 1745-248 in Terzan 5 with MAXI
Motoko Serino, Tatehiro Mihara, Masaru Matsuoka +5
MAXI/GSC detected a superburst from EXO 1745-248 in the globular cluster Terzan 5 on 2011 October 24. The GSC light curve shows an exponential decay with an e-folding time of 0.3 d…
Outburst of LS V+44 17 Observed by MAXI and RXTE, and Discovery of a Dip Structure in the Pulse Profile
Ryuichi Usui, Mikio Morii, Nobuyuki Kawai +28
We report on the first observation of an X-ray outburst of a Be/X-ray binary pulsar LS V +44 17/RX J0440.9+4431, and the discovery of an absorption dip structure in the pulse profi…