A. Y. Lien
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View article: Constraints on Diffuse X-Ray Emission from the TeV Halo Candidate HESS J1813-126
Constraints on Diffuse X-Ray Emission from the TeV Halo Candidate HESS J1813-126 Open
Extended regions of very high-energy γ -ray emission associated with middle-aged pulsars have been found by γ -ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a pu…
View article: A machine-learning empowered search for sub-minute optical transient events with the <i>Deeper, Wider, Faster</i> programme
A machine-learning empowered search for sub-minute optical transient events with the <i>Deeper, Wider, Faster</i> programme Open
Optical transient surveys continue to generate increasingly large data sets, prompting the introduction of machine-learning algorithms to search for quality transient candidates efficiently. Existing machine-learning infrastructure can be …
View article: The 157 Month <i>Swift</i>/BAT All-sky Hard X-Ray Survey
The 157 Month <i>Swift</i>/BAT All-sky Hard X-Ray Survey Open
The Burst Alert Telescope (BAT) on board the Neil Gehrels Swift Observatory has been serving as a survey instrument for the hard X-ray sky, and has detected thousands of X-ray sources (e.g., active galactic nuclei, X-ray binaries, etc). BA…
View article: <tt>BatAnalysis</tt>—A Comprehensive Python Pipeline for Swift BAT Time-tagged Event Data Analysis
BatAnalysis—A Comprehensive Python Pipeline for Swift BAT Time-tagged Event Data Analysis Open
The Neil Gehrels Swift Observatory (Swift) Burst Alert Telescope (BAT) is a coded aperture gamma-ray instrument with a large field of view that was designed to detect and localize transient events. When a transient is detected, either on b…
View article: Explaining Nonmerger Gamma-Ray Bursts and Broad-lined Supernovae with Close Binary Progenitors with Black Hole Central Engines
Explaining Nonmerger Gamma-Ray Bursts and Broad-lined Supernovae with Close Binary Progenitors with Black Hole Central Engines Open
For over 25 yr, the origin of long-duration gamma-ray bursts (lGRBs) has been linked to the collapse of rotating massive stars. However, we have yet to pinpoint the stellar progenitor powering these transients. Moreover, the dominant engin…
View article: The 157-month Swift-BAT All-Sky Hard X-Ray Survey
The 157-month Swift-BAT All-Sky Hard X-Ray Survey Open
The Burst Alert Telescope (BAT) onboard the Neil Gehrels Swift observatory has been serving as a survey instrument for the hard X-ray sky, and has detected thousands of X-ray sources (e.g., AGNs, X-ray binaries, etc). BAT monitors these X-…
View article: Constraints on diffuse X-ray Emission from the TeV halo Candidate HESS J1813-126
Constraints on diffuse X-ray Emission from the TeV halo Candidate HESS J1813-126 Open
Extended regions of very high energy $γ$-ray emission associated with middle-aged pulsars have been found by $γ$-ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a …
View article: An optically led search for kilonovae to <i>z</i>∼0.3 with the Kilonova and Transients Programme (KNTraP)
An optically led search for kilonovae to <i>z</i>∼0.3 with the Kilonova and Transients Programme (KNTraP) Open
Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered by radioactive decay of newly synthesised r-process elements. A few kilonova candidates have been observed duri…
View article: BatAnalysis -- A Comprehensive Python Pipeline for Swift BAT Time-Tagged Event Data Analysis
BatAnalysis -- A Comprehensive Python Pipeline for Swift BAT Time-Tagged Event Data Analysis Open
The Swift Burst Alert Telescope (BAT) is a coded aperture gamma-ray instrument with a large field of view that was designed to detect and localize transient events. When a transient is detected, either on-board or externally, the BAT saves…
View article: Characterization of a Peculiar Einstein Probe Transient EP240408a: An Exotic Gamma-Ray Burst or an Abnormal Jetted Tidal Disruption Event?
Characterization of a Peculiar Einstein Probe Transient EP240408a: An Exotic Gamma-Ray Burst or an Abnormal Jetted Tidal Disruption Event? Open
We present the results of our multiwavelength (X-ray to radio) follow-up campaign of the Einstein Probe transient EP240408a. The initial 10 s trigger displayed bright soft X-ray (0.5–4 keV) radiation with peak luminosity L X ≳ 10 49 (10 50…
View article: GRB 220831A: a hostless, intermediate gamma-ray burst with an unusual optical afterglow
GRB 220831A: a hostless, intermediate gamma-ray burst with an unusual optical afterglow Open
GRB 220831A is a gamma-ray burst (GRB) with a duration and spectral peak energy that places it at the interface between the distribution of long-soft and short-hard GRBs. In this paper, we present the multiwavelength follow-up campaign to …
View article: An Optically Led Search for Kilonovae to z$\sim$0.3 with the Kilonova and Transients Program (KNTraP)
An Optically Led Search for Kilonovae to z$\sim$0.3 with the Kilonova and Transients Program (KNTraP) Open
Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered by radioactive decay of newly synthesised r-process elements. A few kilonova candidates have been observed duri…
View article: Characterization of a peculiar Einstein Probe transient EP240408a: an exotic gamma-ray burst or an abnormal jetted tidal disruption event?
Characterization of a peculiar Einstein Probe transient EP240408a: an exotic gamma-ray burst or an abnormal jetted tidal disruption event? Open
We present the results of our multi-wavelength (X-ray to radio) follow-up campaign of the Einstein Probe transient EP240408a. The initial 10 s trigger displayed bright soft X-ray (0.5-4 keV) radiation with peak luminosity $L_\textrm{X} \gt…
View article: Explaining Non-Merger Gamma-Ray Bursts and Broad-Lined Supernovae with Close Binary Progenitors with Black Hole Central Engine
Explaining Non-Merger Gamma-Ray Bursts and Broad-Lined Supernovae with Close Binary Progenitors with Black Hole Central Engine Open
For over 25 years, the origin of long-duration gamma-ray bursts (lGRBs) has been linked to the collapse of rotating massive stars. However, we have yet to pinpoint the stellar progenitor powering these transients. Moreover, the dominant en…
View article: A Radio Flare in the Long-lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions?
A Radio Flare in the Long-lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions? Open
We present the discovery of the radio afterglow of the short gamma-ray burst (GRB) 210726A, localized to a galaxy at a photometric redshift of z ∼ 2.4. While radio observations commenced ≲1 day after the burst, no radio emission was detect…
View article: Evidence of a Strong 19.5 Hz Flux Oscillation in Swift BAT and Fermi GBM Gamma-Ray Data from GRB 211211A
Evidence of a Strong 19.5 Hz Flux Oscillation in Swift BAT and Fermi GBM Gamma-Ray Data from GRB 211211A Open
The gamma-ray burst (GRB) GRB 211211A is believed to have occurred due to the merger of two neutron stars or a neutron star and a black hole, despite its duration of more than a minute. Subsequent analysis has revealed numerous interesting…
View article: Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable
Identification of 1RXS J165424.6-433758 as a Polar Cataclysmic Variable Open
We present the results of our X-ray, ultraviolet, and optical follow-up campaigns of 1RXS J165424.6-433758, an X-ray source detected with the Swift Deep Galactic Plane Survey. The source X-ray spectrum (Swift and NuSTAR) is described by th…
View article: A Radio Flare in the Long-Lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions?
A Radio Flare in the Long-Lived Afterglow of the Distant Short GRB 210726A: Energy Injection or a Reverse Shock from Shell Collisions? Open
We present the discovery of the radio afterglow of the short $γ$-ray burst (GRB) 210726A, localized to a galaxy at a photometric redshift of $z\sim 2.4$. While radio observations commenced $\lesssim 1~$day after the burst, no radio emissio…
View article: BatAnalysis - A Comprehensive Python Pipeline for Swift BAT Survey Analysis
BatAnalysis - A Comprehensive Python Pipeline for Swift BAT Survey Analysis Open
The Swift Burst Alert Telescope (BAT) is a coded-aperture gamma-ray instrument with a large field of view that primarily operates in survey mode when it is not triggering on transient events. The survey data consist of 80- channel detector…
View article: BatAnalysis: A Comprehensive Python Pipeline for Swift BAT Survey Analysis
BatAnalysis: A Comprehensive Python Pipeline for Swift BAT Survey Analysis Open
The Swift Burst Alert Telescope (BAT) is a coded-aperture gamma-ray instrument with a large field of view that primarily operates in survey mode when it is not triggering on transient events. The survey data consist of 80-channel detector …
View article: Limits on Leptonic TeV Emission from the Cygnus Cocoon with Swift-XRT
Limits on Leptonic TeV Emission from the Cygnus Cocoon with Swift-XRT Open
γ -ray observations of the Cygnus Cocoon, an extended source surrounding the Cygnus X star-forming region, suggest the presence of a cosmic-ray accelerator reaching energies up to a few PeV. The very-high-energy (VHE; 0.1–100 TeV) γ -ray e…
View article: BatAnalysis -- A Comprehensive Python Pipeline for Swift BAT Survey Analysis
BatAnalysis -- A Comprehensive Python Pipeline for Swift BAT Survey Analysis Open
The Swift Burst Alert Telescope (BAT) is a coded aperture gamma-ray instrument with a large field of view that primarily operates in survey mode when it is not triggering on transient events. The survey data consists of eighty-channel dete…
View article: GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst
GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst Open
We report the discovery of the unusually bright long-duration gamma-ray burst (GRB), GRB 221009A, as observed by the Neil Gehrels Swift Observatory (Swift), Monitor of All-sky X-ray Image, and Neutron Star Interior Composition Explorer Mis…
View article: GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst
GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst Open
We report the discovery of the unusually bright long-duration gamma-ray burst (GRB), GRB 221009A, as observed by the Neil Gehrels Swift Observatory (Swift), Monitor of All-sky X-ray Image (MAXI), and Neutron Star Interior Composition Explo…
View article: Gamma-ray Transient Network Science Analysis Group Report
Gamma-ray Transient Network Science Analysis Group Report Open
The Interplanetary Network (IPN) is a detection, localization and alert system that utilizes the arrival time of transient signals in gamma-ray detectors on spacecraft separated by planetary baselines to geometrically locate the origin of …
View article: All-sky Medium Energy Gamma-ray Observatory eXplorer mission concept
All-sky Medium Energy Gamma-ray Observatory eXplorer mission concept Open
The All-sky Medium Energy Gamma-ray Observatory eXplorer (AMEGO-X) is designed to identify and characterize gamma rays from extreme explosions and accelerators. The main science themes include supermassive black holes and their connections…
View article: Improving the Low-energy Transient Sensitivity of AMEGO-X using Single-site Events
Improving the Low-energy Transient Sensitivity of AMEGO-X using Single-site Events Open
AMEGO-X, the All-sky Medium Energy Gamma-ray Observatory eXplorer, is a proposed instrument designed to bridge the so-called “MeV gap” by surveying the sky with unprecedented sensitivity from ∼100 keV to about 1 GeV. This energy band is of…