A5010935116- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Lightning and Electromagnetic Phenomena
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Earthquake Detection and Analysis
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Optical Systems and Laser Technology
- Infrared Target Detection Methodologies
Sungkyunkwan University
2015-2024
Instituto de Astrofísica de Andalucía
2013-2024
University of Nova Gorica
2024
The University of Tokyo
2019-2023
Seoul National University of Science and Technology
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2023
Ewha Womans University
2008-2020
Advanced Institute of Convergence Technology
2020
Seoul National University
2020
Pennsylvania State University
2019
MicroRNAs (miRNAs) are short RNA molecules that negatively regulate gene expression primarily by degrading target mRNA or inhibit the translation of protein product. Recently, many reports have shown altered miRNA in various diseases. However, there no on related to periodontitis. Thus, this study aimed compare miRNAs differentially expressed healthy and chronic periodontitis tissues determine closely associated with To find out induced tissues, microarray was carried confirmed real-time...
GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in outskirts of spiral galaxy at z=0.1613, projected physical offset 16 kpc from galaxy's center. We present X-ray, optical/nIR radio observations its counterpart model them with two distinct components emission: standard afterglow, arising interaction relativistic jet surrounding medium, kilonova, powered radioactive decay sub-relativistic ejecta. Broadband modeling afterglow...
We report the results of our observing campaign on GRB140903A, a nearby (z=0.351) short duration (T90~0.3 s) gamma-ray burst discovered by Swift. monitored X-ray afterglow with Chandra up to 21 days after burst, and detected steeper decay flux approximately 1 day. Continued monitoring at optical radio wavelengths showed similar in nearly same time, we interpret it as evidence narrowly collimated jet. By using standard fireball model describe evolution, derive jet opening angle 5 deg...
Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come extragalactic sources. Their arrival is infrequent, so detection requires instruments large collecting areas. In this work, we report of an extremely particle recorded by surface detector array Telescope Array experiment. We calculate particle's energy as [Formula: see text] (~40 joules). Its direction points back a void in large-scale structure Universe. Possible...
Abstract Bursts of gamma ray showers have been observed in coincidence with downward propagating negative leaders lightning flashes by the Telescope Array Surface Detector (TASD). The TASD is a 700‐km 2 cosmic observatory located southwestern Utah, USA. In data collected between 2014 and 2016, correlated observations showing structure temporal development three shower‐producing were obtained 3‐D mapping array, electric field change measurements for an additional seven flashes, both cases...
GRB 130925A was an unusual gamma ray burst (GRB), consisting of three distinct episodes high-energy emission spanning ∼20 ks, making it a member the proposed category ‘ultralong’ bursts. It also in that its late-time X-ray observed by Swift very soft, and showed strong hard-to-soft spectral evolution with time. This evolution, rarely seen afterglows, can be well modelled as dust-scattered echo prompt emission, stringent limits on contribution from normal afterglow (i.e. external shock)...
One of the uncertainties in interpretation ultrahigh energy cosmic ray data comes from hadronic interaction models used for air shower Monte Carlo (MC) simulations. The number muons observed at ground ray--induced showers is expected to depend upon model. may therefore test by comparing measured with MC prediction. In this paper, we present results studies muon densities extensive obtained analyzing signal surface detector stations which should have high purity. purity a station will on both...
In this paper we report the first close, high-resolution observations of downward-directed terrestrial gamma-ray flashes (TGFs) detected by large-area Telescope Array cosmic ray observatory, obtained in conjunction with broadband VHF interferometer and fast electric field change measurements parent discharge. The results show that TGFs occur during strong initial breakdown pulses (IBPs) few milliseconds negative cloud-to-ground low-altitude intracloud flashes, IBPs are produced a...
The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. analysis employs Boosted Decision tree (BDT) multivariate built upon 14 observables related to both properties of shower front and lateral distribution function. classifier is trained Monte-Carlo sets events induced by primary protons iron. An average atomic UHECR presented for energies $1{0}^{18.0}--1{0}^{20.0}\text{ }\text{ }\mathrm{eV}$. particles shows no...
We report on a measurement of the cosmic ray composition by Telescope Array Low-Energy Extension (TALE) air fluorescence detector (FD). By making use Cherenkov light signal in addition to from (CR) induced extensive showers, TALE FD can measure properties rays with energies as low $\sim 2$ PeV and exceeding 1 EeV. In this paper, we present results $X_{\rm max}$ distributions showers observed over energy range. Data collected period 4$ years was analyzed for study. The resulting are compared...
Abstract The Cosmic Ray Energetics And Mass for the International Space Station (ISS-CREAM) experiment successfully recorded data 539 days from 2017 August to 2019 February. We report energy spectrum of cosmic-ray protons ISS-CREAM at energies 1.60 × 10 3 6.55 5 GeV. measured deviates a single power law. A smoothly broken power-law fit data, including statistical and systematic uncertainties, shows spectral index change 9.0 GeV 2.57 ± 0.03 2.82 0.02 with significance greater than σ . This...
TUS (Tracking Ultraviolet Set-up), the first orbital detector of extreme energy cosmic rays (EECRs), those with energies above 50 EeV, was launched into orbit on April 28, 2016, as a part Lomonosov satellite scientific payload. The main aim mission is to test technique registering fluorescent and Cherenkov radiation extensive air showers generated by EECRs in atmosphere space telescope. We present preliminary results its operation mode dedicated period from August 16, November 4, 2016. No...
Abstract In this paper, we present the first high‐speed video observation of a cloud‐to‐ground lightning flash and its associated downward‐directed Terrestrial Gamma‐ray Flash (TGF). The optical emission event was observed by camera running at 40,000 frames per second in conjunction with Telescope Array Surface Detector, Lightning Mapping Array, interferometer, electric‐field fast antenna, National Detection Network. TGF formed downward leader followed very intense return stroke peak current...
Abstract Thanks to the rapidly increasing time-domain facilities, we are entering a golden era of research on gamma-ray bursts (GRBs). In this Letter, report our observations GRB 240529A with Burst Optical Observer and Transient Exploring System, 1.5 m telescope at Observatorio de Sierra Nevada, 2.5 Wide Field Survey Telescope China, Large Binocular Telescope, Telescopio Nazionale Galileo. The prompt emission shows two comparable energetic episodes separated by quiescence time roughly 400 s....
We report on design, manufacture, and testing of a Slewing Mirror Telescope (SMT), the first its kind part Ultra-Fast Flash Observatory-pathfinder (UFFO-p) for space-based prompt measurement early UV/optical light curves from Gamma-Ray Bursts (GRBs).Using fast slewing mirror 150 mm diameter mounted 2 axis gimbal stage, SMT can deliver images GRB optical counterparts to intensified CCD detector within 1.5~1.8s over ± 35 degrees in field view.Its Ritchey-Chrétien telescope 100 provides 17 ×...
Abstract The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and flux pattern 23 nearby starburst galaxies (SBGs). In this Letter, we tested same hypothesis using detected by Telescope Array experiment (TA) in 9 yr period from 2008 May to 2017 May. Unlike analysis, did not optimize parameter values but kept them fixed best-fit found Auger, namely 9.7% for anisotropic fraction assumed originate SBGs...
Abstract Motivated by the detection of a significant dipole structure in arrival directions ultra-high-energy cosmic rays above 8 EeV reported Pierre Auger Observatory (Auger), we search for large-scale anisotropy using data collected with surface detector array Telescope Array Experiment (TA). With 11 yr TA data, projection R.A. is fitted an amplitude 3.3% ± 1.9% and phase 131° 33°. The corresponding 99% confidence-level upper limit on 7.3%. At current level statistics, result compatible...
One of the least documented and understood aspects gamma-ray bursts (GRBs) is rise phase optical light curve. The Ultra-Fast Flash Observatory (UFFO) an effort to address this question through extraordinary opportunities presented by a series space missions including small spacecraft observatory. UFFO equipped with fast-response Slewing Mirror Telescope (SMT) that uses rapidly moving mirror or array redirect beam rather than slewing entire aim instrument at GRB position. will probe early...
Abstract We investigate the prompt emission and afterglow properties of short-duration gamma-ray burst (sGRB) 130603B another eight sGRB events during 2012–2015, observed by several multiwavelength facilities including Gran Canarias Telescope 10.4 m telescope. Prompt high energy data were obtained INTEGRAL-SPI-ACS, Swift-BAT, Fermi-GBM satellites. The INTEGRAL in range 0.1–10 MeV for 130603B, 140606A, 140930B, 141212A, 151228A do not show any signature extended or precursor activity their...