A5100389704- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- High-pressure geophysics and materials
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- SAS software applications and methods
- Dark Matter and Cosmic Phenomena
- Geophysics and Sensor Technology
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- earthquake and tectonic studies
- Magnetic confinement fusion research
- Superconducting Materials and Applications
- Galaxies: Formation, Evolution, Phenomena
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
China-Japan Friendship Hospital
2025
Chinese Academy of Medical Sciences & Peking Union Medical College
2017-2025
PLA Information Engineering University
2021-2025
Jiangnan University
2025
University of Nevada, Reno
2006-2025
Xiamen University
2014-2024
University of Nevada, Las Vegas
2015-2024
Henan University of Technology
2024
Guizhou Normal University
2024
Affiliated Eye Hospital of Wenzhou Medical College
2024
(Abridged) The Swift X-Ray Telescope (XRT) reveals some interesting features of early X-ray afterglows, including a distinct rapidly decaying component preceding the conventional afterglow in many sources, shallow decay before more ``normal'' observed good fraction GRBs (e.g. GRB 050128, 050315, 050319, and 050401), flares nearly half afterglows 050406, 050502B, 050607, 050724). In this paper, we systematically analyze possible physical processes that shape properties lightcurves, use data...
The recent Fermi observation of GRB 080916C shows that the bright photosphere emission associated with a putative fireball is missing, which suggests Poynting-flux-dominated outflow. We propose model gamma-ray burst (GRB) prompt in regime, namely, Internal-Collision-induced MAgnetic Reconnection and Turbulence (ICMART) model. It envisaged central engine launches an intermittent, magnetically-dominated wind, region, ejecta still moderately magnetized. Similar to internal shock (IS) model,...
The cosmological gamma-ray burst (GRB) phenomenon is reviewed. broad observational facts and empirical phenomenological relations of the GRB prompt emission afterglow are outlined. A well-tested, successful fireball shock model introduced in a pedagogical manner. Several important uncertainties current understanding reviewed, prospects how future experiments extensive theoretical efforts may address these problems discussed.
Gamma-ray burst (GRB) afterglows have provided important clues to the nature of these massive explosive events, providing direct information on nearby environment and indirect central engine that powers burst. We report discovery two bright x-ray flares in GRB afterglows, including a giant flare comparable total energy itself, each peaking minutes after These strong, rapid imply engines bursts long periods activity, with strong internal shocks continuing for hundreds seconds gamma-ray...
We investigate the consequences of a continuously injecting central engine on gamma-ray burst afterglow emission, focusing more specifically highly magnetized millisecond pulsar engine. For initial parameters within certain region parameter space, light curves are predicted to show distinctive achromatic bump feature, onset and duration which range from minutes months, depending fireball parameters. The detection of, or upper limits on, such features would provide constraints progenitor...
(Abridged) The two high-redshift gamma-ray bursts, GRB 080913 at z=6.7 and 090423 z=8.3, recently detected by Swift appear as intrinsically short, hard GRBs. They could have been recognized BATSE short/hard GRBs should they occurred z <= 1. We perform a more thorough investigation on physically distinct types (Type I/II) of cosmological their observational characteristics. reiterate the definitions Type I/II review criteria physical motivations. Contrary to traditional approach assigning...
Recent observations support the suggestion that short-duration gamma-ray bursts are produced by compact star mergers. The x-ray flares discovered in two short last much longer than previously proposed postmerger energy-release time scales. Here, we show they can be differentially rotating, millisecond pulsars after mergers of binary neutron stars. differential rotation leads to windup interior poloidal magnetic fields and resulting toroidal strong enough float up break through stellar...
We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for total 76 GRBs, and present an additional three pre-Swift not included in earlier sample. Furthermore, we publish 840 new points 42 GRB afterglows, sets 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A 080810. analyzed light curves all derived spectral energy distributions with best quality, allowing us estimate host...
Since the successful launch of NASA's dedicated gamma-ray burst (GRB) mission, Swift, study cosmological GRBs has entered a new era. Here I review rapid observational and theoretical progress in this dynamical research field during first two-year Swift focusing on how breakthroughs have revolutionized our understanding physical origins GRBs. Besides summarizing helps to solve some pre-Swift mysteries, also list outstanding problems raised by observations. An outlook GRB science future,...
Controlling the degradation process of silk is an important and interesting subject in field biomaterials. In present study, fibroin films with different secondary conformations nanostructures were used to study behavior buffered protease XIV solution. Different from previous studies, highest β-sheet content achieved rate our research. A new mechanism revealed that was related not only crystal but also hydrophilic interaction then crystal−noncrystal alternate nanostructures. First, blocks...
We present a systematic temporal and spectral study of all Swift-X-ray Telescope observations gamma-ray burst (GRB) afterglows discovered between 2005 January 2007 December. After constructing fitting light curves spectra to power-law models, we classify the components each afterglow in terms canonical X-ray test them against closure relations forward shock models for variety parameter combinations. The are used identify potential jet breaks with characteristics including uniform model...
The physical nature of Fast Radio Bursts (FRBs), a new type cosmological transients discovered recently, is not known. It has been suggested that FRBs can be produced when spinning supra-massive neutron star loses centrifugal support and collapses to black hole. Here we suggest such implosions happen in stars shortly (hundreds thousands seconds) after their births, an observational signature may have observed the X-ray afterglows some long short gamma-ray bursts (GRBs). Within this picture,...
Gamma-ray bursts (GRBs) have been separated into two classes, originally along the lines of duration and spectral properties, called "short/hard" "long/soft." The latter conclusively linked to explosive deaths massive stars, while former are thought result from merger or collapse compact objects. In recent years, indications accumulating that short/hard versus long/soft division does not map directly onto what would be expected classes progenitors, leading a new classification scheme Type I...
ABSTRACT The discoveries of GW150914, GW151226, and LVT151012 suggest that double black hole (BH–BH) mergers are common in the universe. If at least one two merging holes (BHs) carries a certain amount charge, possibly retained by rotating magnetosphere, inspiral BH–BH system would drive global magnetic dipole normal to orbital plane. rapidly evolving moment during process Poynting flux with an increasing wind power. magnetospheric activities final phase merger make fast radio burst (FRB) if...
The dispersive sweep of fast radio bursts (FRBs) has been used to probe the ionized baryon content intergalactic medium, which is assumed dominate total extragalactic dispersion. While host galaxy contributions dispersion measure (DM) appear be small for most FRBs, in at least one case there evidence an extreme magneto-ionic local environment and a compact persistent source. Here we report detection localization repeating FRB 20190520B, co-located with compact, source associated dwarf high...
ABSTRACT The discovery of a fast radio burst (FRB) in our Galaxy associated with magnetar (neutron star strong magnetic field) has provided critical piece information to help us finally understand these enigmatic transients. We show that the volumetric rate Galactic-FRB like events is consistent faint end cosmological FRB rate, and hence they most likely belong same class Galactic had an accompanying X-ray burst, but many bursts from object no counterpart. Their relative rates suggest for...