157 citations · 791 across the 20 of their papers we have counts for
21 papers
EP240414a: Off-axis View of a Jet-Cocoon System from an Expanded Progenitor Star
Jian-He Zheng, Jin-Ping Zhu, Wenbin Lu +1
When a relativistic jet is launched following the core-collapse of a star, its interaction with the stellar envelope leads to the formation of a hot cocoon, which produces various…
EP240801a/XRF 240801B: An X-ray Flash Detected by the Einstein Probe and Implications of its Multiband Afterglow
Shuai-Qing Jiang, Dong Xu, Agnes P. C. van Hoof +89
We present multiband observations and analysis of EP240801a, a low-energy, extremely soft gamma-ray burst (GRB) discovered on August 1, 2024 by the Einstein Probe (EP) satellite, w…
The Host Galaxy of the Hyperactive Repeating FRB 20240114A: Behind a Galaxy Cluster
Xiang-Lei Chen, Chao-Wei Tsai, Di Li +16
We report on the optical spectroscopic observations of the host galaxy of the hyperactive repeating fast radio burst, FRB 20240114A. The host galaxy is a dwarf galaxy at a redshift…
Isolated Black Holes as Potential PeVatrons and Ultrahigh-energy Gamma-ray Sources
Shigeo S. Kimura, Kengo Tomida, Masato I. N. Kobayashi +2
The origin of PeV cosmic rays is a long-standing mystery, and ultrahigh-energy gamma-ray observations would play a crucial role in identifying it. Recently, LHAASO reported the dis…
Separating repeating fast radio bursts using the minimum spanning tree as an unsupervised methodology
C. R. García, Diego F. Torres, Jia-Ming Zhu-Ge +1
Fast radio bursts (FRBs) represent one of the most intriguing phenomena in modern astrophysics. However, their classification into repeaters and non-repeaters is challenging. Here,…
Magnetization Factors of Gamma-Ray Burst Jets Revealed by a Systematic Analysis of the Fermi Sample
An Li, He Gao, Lin Lan +1
The composition of gamma-ray burst (GRB) jets remained a mystery until recently. In practice, we usually characterize the magnetization of the GRB jets () through the ratio be…
Long-term radio monitoring of the fast X-ray transient EP240315a: evidence for a relativistic jet
R. Ricci, E. Troja, Y. Yang +7
The recent launch of Einstein Probe (EP) in early 2024 opened up a new window onto the transient X-ray sky, allowing for real-time discovery and follow-up of fast X-ray transients…
Triggering the Untriggered: The First Einstein Probe-Detected Gamma-Ray Burst 240219A and Its Implications
Yi-Han Iris Yin, Bin-Bin Zhang, Jun Yang +49
The Einstein Probe (EP) achieved its first detection and localization of a bright X-ray flare, EP240219a, on 2024 February 19, during its commissioning phase. Subsequent targeted s…
Engine-fed Kilonovae (Mergernovae) -- II. Radiation
Shunke Ai, He Gao, Bing Zhang
The radioactive power generated by materials within the ejecta of a binary-neutron-star (BNS) merger powers an optical transient known as a kilonova. When the central remnant of a…
Evidence of High-latitude Emission in the Prompt Phase of GRBs: How Far from the Central Engine are the GRBs Produced?
Z. Lucas Uhm, Donggeun Tak, Bing Zhang +5
One of the difficulties in nailing down the physical mechanism of gamma-ray bursts (GRBs) comes from the fact that there has been no clear observational evidence on how far from th…
Physical Implications of the Sub-threshold GRB GBM-190816 and its Associated Sub-threshold Gravitational Wave Event
Yi-Si Yang, Shu-Qing Zhong, Bin-Bin Zhang +10
The LIGO-Virgo and Fermi collaborations recently reported a possible joint detection of a sub-threshold gravitational wave (GW) event and a sub-threshold gamma-ray burst (GRB), GBM…
The shallow decay segment of GRB X-ray afterglow revisited
Litao Zhao, Binbin Zhang, He Gao +3
Based on the early-year observations from Neil Gehrels \emph{Swift} Observatory, \cite{liang07} performed a systematic analysis for the shallow decay component of gamma-ray bursts…
Multi-color blackbody emission in GRB 081221
Shu-Jin Hou, Bin-Bin Zhang, Yan-Zhi Meng +9
The radiation mechanism of the prompt emission of gamma-ray bursts (GRBs) remains an open question. Although their spectra are usually well fitted with the empirical Band function,…
Magnetized Reverse Shock: Density-fluctuation-induced Field Distortion, Polarization Degree Reduction, and Application to GRBs
Wei Deng, Bing Zhang, Hui Li +1
The early optical afterglow emission of several gamma-ray bursts (GRBs) shows a high linear polarization degree (PD) of tens of percent, suggesting an ordered magnetic field in the…
Synchrotron Origin of the Typical GRB Band Function - A Case Study of GRB 130606B
Bin-Bin Zhang, Z. Lucas Uhm, Valerie Connaughton +2
We perform a time-resolved spectral analysis of GRB 130606B within the framework of a fast-cooling synchrotron radiation model with magnetic field strength in the emission region d…
A Comprehensive Analysis of Fermi Gamma-ray Burst Data: III. Energy-Dependent T90 Distributions of GBM GRBs and Instrumental Selection Effect on Duration Classification
Ying Qin, En-Wei Liang, Yun-Feng Liang +8
The durations (T90) of 315 GRBs detected with Fermi/GBM (8-1000 keV) by 2011 September are calculated using the Bayesian Block method. We compare the T90 distributions between this…
A Comprehensive Analysis of Fermi Gamma-ray Burst Data: II. -Evolution Patterns and Implications for the Observed Spectrum-Luminosity Relations
Rui-Jing Lu, Jun-Jie Wei, En-Wei Liang +6
We present a time-resolved spectral analysis of 51 long and 11 short bright GRBs observed with the {\em Femri}/GBM, paying special attention to evolution within a same…
Observational constraints on the external shock prior emission hypothesis of GRBs
Tesla Birnbaum, Bing Zhang, Bin-Bin Zhang +1
An intriguing hypothesis, that there exists a decaying X-ray emission component before the GRB trigger, has been suggested in order to explain the shallow decay phase of the X-ray…
Is GeV Emission from Gamma-Ray Bursts of External Shock Origin?
Amanda Maxham, Bin-Bin Zhang, Bing Zhang
Recent observations of Gamma-Ray Bursts (GRBs) by the Fermi Large Area Telescope (LAT) revealed a power law decay feature of the high energy emission (above 100 MeV), which led to…
A New Classification Method for Gamma-Ray Bursts
Houjun Lv, Enwei Liang, Binbin Zhang +1
Recent Swift observations suggest that the traditional long vs. short GRB classification scheme does not always associate GRBs to the two physically motivated model types, i.e. Typ…
A Comprehensive Analysis of Swift/XRT Data: IV. Single Power-Law Decaying Lightcurves vs. Canonical Lightcurves and Implications for a Unified Origin of X-rays
En-Wei Liang, Hou-Jun Lv, Shu-Jin Hou +2
By analyzing the Swift/XRT lightcurves detected before 2009 July, we find 19 cases that monotonously decay as a single power law (SPL) with an index of 1 ~ 1.7 from tens (or hundre…