A5038796052- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- High-pressure geophysics and materials
National Astronomical Observatory of Japan
2021-2025
Institute of Astronomy and Astrophysics, Academia Sinica
2023-2025
The University of Tokyo
2021-2023
We present a detection of bright burst from FRB 20201124A, which is one the most active repeating FRBs, based on S-band observations with 64-m radio telescope at Usuda Deep Space Center/JAXA. This first observed by using Japanese facility. Our 2 GHz in February 2022 highest frequency for this and fluence $>$ 189 Jy ms brightest bursts source. place an upper limit spectral index $\alpha$ = -2.14 S band non-detection X same time. compare event rate detected ones previous research, suggest that...
Abstract The origin of fast radio bursts (FRBs), highly energetic, millisecond-duration pulses originating from beyond our galaxy, remains unknown. Observationally, FRBs are classified as non-repeating or repeating, however, this classification is complicated by limited observing time and sensitivity constraints, which may result in some repeating being misidentified non-repeating. To address issue, we adopt both empirical machine-learning techniques previous studies to identify candidates...
The soft gamma-ray repeater Swift J1555.2-5402 was discovered by means of a 12-ms duration short burst detected with BAT on 2021 June 3. Then 1.6 hours after the first detection, NICER started daily monitoring this X-ray source for month. absorbed 2-10 keV flux stays nearly constant at around 4e-11 erg/s/cm2 during timespan, showing only slight gradual decline. A 3.86-s periodicity is detected, and time derivative period measured to be 3.05(7)e-11 s/s. pulse shows single sinusoidal shape...
We report on the multi-frequency multi-epoch radio observations of magnetar, XTE J1810-197, which exhibited a outburst from December 2018 after its 10-year quiescent period. performed quasi-simultaneous with VERA (22 GHz), Hitachi (6.9 GHz and 8.4 Kashima (2.3 Iitate (0.3 GHz) telescopes located in Japan to trace variability magnetar pulsations during observing period 13 12 June 2019. The pulse width goes narrower as frequency higher, analogous general profile narrowing behavior ordinary...
We present a detection of bright burst from FRB 20201124A, which is one the most active repeating FRBs, based on S-band observations with 64-m radio telescope at Usuda Deep Space Center/JAXA. This first observed by using Japanese facility. Our 2 GHz in February 2022 highest frequency for this and fluence $>$ 189 Jy ms brightest bursts source. place an upper limit spectral index $α$ = -2.14 S band non-detection X same time. compare event rate detected ones previous research, suggest that...