A5089510847- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Pulsars and Gravitational Waves Research
- High-Energy Particle Collisions Research
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Black Holes and Theoretical Physics
- Astronomy and Astrophysical Research
- Atomic and Subatomic Physics Research
- Noncommutative and Quantum Gravity Theories
- Radio Astronomy Observations and Technology
- Medical Imaging Techniques and Applications
- Genetic Associations and Epidemiology
- Nuclear physics research studies
- Computational Physics and Python Applications
- Galaxies: Formation, Evolution, Phenomena
- earthquake and tectonic studies
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
University of Chinese Academy of Sciences
2020-2025
Beijing Normal University
2016-2025
Purple Mountain Observatory
2013-2025
Imperial College London
2018-2024
Southwest University
2024
Public Health England
2024
Medical Research Council
2024
Institute of High Energy Physics
2012-2024
Chinese Academy of Sciences
2010-2024
Nankai University
2024
We present a systematic analysis of the spectral and temporal properties 17 gamma-ray bursts (GRBs) codetected by Gamma-ray Burst Monitor (GBM) Large Area Telescope (LAT) onboard Fermi satellite in 2010 May. performed time-resolved all bursts, with finest resolution allowed statistics, to reduce smearing different components. found that spectra 14 out GRBs are best modeled classical "Band" function over entire range, which may suggest common origin for emissions detected LAT GBM. GRB 090902B...
Double neutron star (DNS) merger events are promosing candidates of short Gamma-ray Burst (sGRB) progenitors as well high-frequecy gravitational wave (GW) emitters. On August 17, 2017, such a coinciding event was detected by both the LIGO-Virgo detector network GW170817 and Gamma-Ray Monitor on board NASA's {\it Fermi} Space Telescope GRB 170817A. Here we show that fluence spectral peak energy this sGRB fall into lower portion distributions known sGRBs. Its isotropic luminosity is abnormally...
The external forward shock (EFS) models have been the standard paradigm to interpret broad-band afterglow data of gamma-ray bursts (GRBs). One prediction is that some temporal breaks at different energy bands should be achromatic. Observations in Swift era revealed chromatic behaviors least GRBs, casting doubts on EFS origin GRB afterglows. In this paper, we perform a systematic study address question: how bad/good are models? Our sample includes 85 GRBs well-monitored X-ray and optical...
Binary neutron star (NS) mergers are strong gravitational-wave (GW) sources and the leading candidates to interpret short-duration gamma-ray bursts (SGRBs). Under assumptions that SGRBs produced by double x-ray plateau followed a steep decay as observed in SGRB light curves marks collapse of supramassive black hole (BH), we use statistical observational properties Swift mass distribution Galactic systems place constraints on equation state (EoS) post-merger product. We show current...
A massive millisecond magnetar may survive a merger of neutron star (NS) binary, which would continuously power the ejecta. We develop generic dynamic model for ejecta with energy injection from central magnetar. The emission (the "merger-nova") powered by peaks in UV band and peak lightcurve progressively shifts to an earlier epoch increasing frequency. magnetar-powered mergernova could have optical brightness comparable supernova, is few tens or hundreds times brighter than...
Well-sampled optical lightcurves of 146 gamma-ray bursts (GRBs) are compiled from the literature. By empirical fitting we identify eight possible emission components and summarize results in a "synthetic" lightcurve. Both flare early shallow-decay likely related to long-term central engine activities. We focus on their statistical properties this paper. Twenty-four flares obtained 19 GRBs. The isotropic R-band energy is smaller than 1% $E_{\gamma, \rm iso}$. relation between luminosities...
The accuracy of Einstein's equivalence principle (EEP) can be tested with the observed time delays between correlated particles or photons that are emitted from astronomical sources. Assuming as a lower limit caused mainly by gravitational potential Milky Way, we prove fast radio bursts (FRBs) cosmological origin used to constrain EEP high accuracy. Taking FRB 110220 and two possible FRB/gamma-ray burst (GRB) association systems (FRB/GRB 101011A FRB/GRB 100704A) examples, obtain strict upper...
We continue our systematic statistical study of various components gamma-ray burst (GRB) optical light curves. decompose the early onset bump and late re-brightening with empirical fits analyze their properties. Among 146 GRBs that have well-sampled curves, bumps are observed in 38 26 GRBs, respectively. It is found typical rising decaying slopes for both ∼1.5 ∼ − 1.15, No X-ray band detected to be associated bumps, while an half bumps. The peak luminosity anti-correlated time Both Lp...
If double neutron star mergers leave behind a massive magnetar rather than black hole, bright early afterglow can follow the gravitational wave burst (GWB) even if there is no short gamma-ray (SGRB) - GWB association or an but SGRB does not beam towards earth. Besides directly dissipating proto-magnetar wind as suggested by Zhang, we here suggest that could push ejecta launched during merger process, and under certain conditions, would reach relativistic speed. Such magnetar-powered ejecta,...
Limited by the sensitivities of current gravitational wave (GW) detectors, central remnant binary neutron star (NS) merger associated with GW170817 remains an open question. Considering relatively large total mass, it is generally proposed that would lead to a shortly lived hypermassive NS or directly produce black hole (BH). There no clear evidence support rule out long-lived as remnant. Here we utilize GW and electromagnetic (EM) signals comprehensively investigate parameter space allows...
A supramassive, strongly-magnetized millisecond neutron star (NS) has been proposed to be the candidate central engine of at least some short gamma-ray bursts (SGRBs), based on "internal plateau" commonly observed in early X-ray afterglow. While a previous analysis shows qualitative consistency between this suggestion and Swift SGRB data, distribution break time $t_b$ is much narrower than collapse supramassive NSs for several NS equations-of-state (EoSs) investigated. In paper, we study...
Neutron star mergers are believed to occur in accretion disks around supermassive black holes. Here we show that a putative jet launched from the merger of binary neutron (BNS) or star--black hole (NSBH) occurring at migration trap an active galactic nucleus (AGN) disk would be choked. The energy is deposited within materials power hot cocoon. cocoon energetic enough break out AGN and produce bright X-ray shock breakout transient peaking $\sim0.15\,{\rm d}$ after merger. peak luminosity...
Based on 10 billion J/ψ events collected at the BESIII experiment, a search for CP violation in Λ decay is performed difference between CP-odd parameters α_{-} Λ→pπ^{-} and α_{+} Λ[over ¯]→p[over ¯]π^{+} by using process e^{+}e^{-}→J/ψ→ΛΛ[over ¯]. With five-dimensional fit to full angular distributions of daughter baryon, most precise values are determined be α_{-}=0.7519±0.0036±0.0024 α_{+}=-0.7559±0.0036±0.0030, respectively. The ¯] averaged value parameter extracted...
We report the total and differential cross sections for $J/\psi$ photoproduction with large acceptance GlueX spectrometer photon beam energies from threshold at 8.2~GeV up to 11.44~GeV over full kinematic range of momentum transfer squared, $t$. Such coverage facilitates extrapolation forward ($t = 0$) point beyond physical region. The section is used by many theoretical models plays an important role in understanding its relation $J/\psi-$proton interaction. These measurements near are also...
GRB 221009A is the brightest gamma-ray burst ever detected since discovery of this kind energetic explosions. However, an accurate measurement prompt emission properties very challenging due to its exceptional brightness. With joint observations \textit{Insight}-HXMT and GECAM-C, we made unprecedentedly during first $\sim$1800 s 221009A, including precursor, main (ME, which dominates in flux), flaring early afterglow, hard X-ray soft band from $\sim$ 10 keV 6 MeV. Based on GECAM-C...
Abstract GRB 221009A is a bright gamma-ray burst (GRB) with isotropic energy larger than 10 54 erg. Its fairly low redshift makes it promising candidate for high-energy neutrino detection. However, search this reported by the IceCube collaboration yielded null result. In paper, we utilize upper limit from observation to test different prompt emission models. We find that, at least specific burst, dissipative photosphere model could be ruled out in large parameter space. The internal-shock...
We search for an axion-like particle (ALP) $a$ through the process $\psi(3686)\rightarrow\pi^+\pi^-J/\psi$, $J/\psi\rightarrow\gamma a$, $a\rightarrow\gamma\gamma$ in a data sample of $(2.71\pm0.01)\times10^9$ $\psi(3686)$ events collected by BESIII detector. No significant ALP signal is observed over expected background, and upper limits on branching fraction decay a$ ALP-photon coupling constant $g_{a\gamma\gamma}$ are set at 95% confidence level mass range $0.165\leq...
We study the process e^{+}e^{-}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by BESIII detector BEPCII collider. The Born cross sections and effective form factors (|G_{eff}|) are determined with unprecedented precision after combining single double-tag methods based on decay Λ_{c}^{+}→pK^{-}π^{+}. Flat around 4.63 obtained no indication of resonant structure Y(4630), as reported Belle, is found. In addition, oscillatory...
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