A5097981832- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
Guangxi University
2024
Abstract GRB 170519A was discovered by the Swift Burst Alert Telescope (BAT) and then observed X-Ray Telescope, UltraViolet Optical ground-based telescopes. We report Lick Katzman Automatic Imaging observations of make temporal analysis spectral joint fits its multiwavelength light curves. The present a relatively complete afterglow structure, including two X-ray flares (Flares I II), optical onset (Slice 1), normal decay (Slices 2 3), possible jet break. spectrum bright flare (Flare II)...
GRB 170519A was discovered by \emph{Swift}/BAT, and then observed \emph{Swift}/XRT, \emph{Swift}/UVOT, ground-based telescopes. We report Lick/KAIT observations of 170519A, make temporal analysis spectral joint fits its multiwavelength light curves. The present a relatively complete afterglow structure, including two X-ray flares (Flares I II), optical onset (Slice 1), normal decay (Slices 2 3), possible jet break. spectrum the bright flare (Flare II) indicates that thermal component exists...
Abstract Mrk 501 is a prototypical high-synchrotron-peaked blazar and serves as one of the primary targets for Imaging X-ray Polarimetry Explorer (IXPE). In this study, we report polarization measurements based on six IXPE observations. The detection at confidence level exceeding 99% achieved in four out observations conducted across entire energy range (2–8 keV) IXPE. maximum degree (Π X ) measured to be 15.8% ± 2.8%, accompanied by angle ( ψ 98.°0 5.°1 5.6 σ . During remaining two...
Abstract GRB 200612A could be classified as an ultralong gamma-ray burst due to its prompt emission lasting up ∼1020 s and the true timescale of central engine activity t ≥ 4 × 10 s. The late X-ray light curve with a decay index α = 7.53 is steeper than steepest possible from external shock model. We propose that this afterglow can driven by dipolar radiation magnetar spindown during early stage, while collapsed into black hole before spindown, resulting in very steep curve. optical data...
Abstract After launching a jet, outflows of magnetar were used to account for the achromatic plateau afterglow and early X-ray flux known as “internal plateau”. The lack detecting magnetic dipole emission together with energy injection feature in single observation poses confusion until long gamma-ray burst (GRB) 210610B is detected. GRB presented an optical bump following during phase. followed by steep decline overlays steadily decaying index α X,1 ∼ 2.06, indicating internal origin that...
Abstract We present early-time ground-based optical follow-up observations of GRB 180418A, which was discovered by both Swift/BAT and Fermi/GBM. Its broadband afterglow well monitored Swift/XRT telescopes. The light curve 180418A can be modeled forward shock (FS) plus reverse (RS). fit the curves with standard external models derive physical properties outflow. It is found that ratio R B ≡ ε , r / f 11.22, indicating a moderate degree magnetization in RS region. reported duration T 90 lies...
Abstract The afterglows of gamma-ray bursts are believed to have originated from a relativistic jet, which is driven by the merger compact binary objects or core collapse massive stars. Some their jets may consist two components: faster (but narrower) jet and slower wider) jet. light curves produced interaction between two-component surrounding medium typically exhibit chromatic break in multiple bands. For GRB 191221B, optical curve afterglow exhibits plateau 33 143 s, followed steeper...