284 citations · 2.3k across the 30 of their papers we have counts for
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GRB220831A: a hostless, intermediate Gamma-ray burst with an unusual optical afterglow
James Freeburn, Brendan O'Connor, Jeff Cooke +20
GRB220831A 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 thi…
Modelling of Long-Term Afterglow Counterparts to Gravitational Wave Events: The Full View of GRB 170817A
Geoffrey Ryan, Hendrik van Eerten, Eleonora Troja +3
The arrival of gravitational wave astronomy and a growing number of time-domain focused observatories are set to lead to a increasing number of detections of short gamma-ray bursts…
Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses
Giulia Gianfagna, Luigi Piro, Francesco Pannarale +3
GW170817 is a binary neutron star merger that exhibited a gravitational wave (GW) and a gamma-ray burst, followed by an afterglow. In this work, we estimate the Hubble constant ($H…
A lanthanide-rich kilonova in the aftermath of a long gamma-ray burst
Yu-Han Yang, Eleonora Troja, Brendan O'Connor +24
Observationally, Kilonovae are astrophysical transients powered by the radioactive decay of nuclei heavier than iron, synthesized in the merger of two compact objects. Over the fir…
The Decoupling of Binaries from Their Circumbinary Disks
Alexander J. Dittmann, Geoffrey Ryan, M. Coleman Miller
We have investigated, both analytically and numerically, accreting supermassive black hole binaries as they inspiral due to gravitational radiation to elucidate the decoupling of b…
A structured jet explains the extreme GRB 221009A
B. O'Connor, E. Troja, G. Ryan +29
Long duration gamma-ray bursts (GRBs) are powerful cosmic explosions, signaling the death of massive stars. Among them, GRB 221009A is by far the brightest burst ever observed. Due…
Joint analysis of gravitational-wave and electromagnetic data of mergers: breaking an afterglow model degeneracy in GW170817 and in future events
Giulia Gianfagna, Luigi Piro, Francesco Pannarale +4
On August 17, 2017, Advanced LIGO and Virgo observed GW170817, the first gravitational-wave (GW) signal from a binary neutron star merger. It was followed by a short-duration gamma…
A nearby long gamma-ray burst from a merger of compact objects
E. Troja, C. L. Fryer, B. O'Connor +21
Gamma-ray bursts (GRBs) are flashes of high-energy radiation arising from energetic cosmic explosions. Bursts of long (>2 s) duration are produced by the core-collapse of massive s…
A Survey of Disc Thickness and Viscosity in Circumbinary Accretion: Binary Evolution, Variability, and Disc Morphology
Alexander J. Dittmann, Geoffrey Ryan
Much of the parameter space relevant to the evolution of astrophysical circumbinary accretion discs remains unexplored. We have carried out a suite of circumbinary disc simulations…
The early afterglow of GRB 190829A
S. Dichiara, E. Troja, V. Lipunov +19
GRB 190829A at z=0.0785 is the fourth closest long GRB ever detected by the Neil Gehrels Swift observatory, and the third confirmed case with a very high energy component. We prese…
Resonant Shattering Flares in Black Hole-Neutron Star and Binary Neutron Star Mergers
Duncan Neill, David Tsang, Hendrik van Eerten +2
Resonant Shattering flares (RSFs) are bursts of gamma-rays expected to be triggered by tidal resonance of a neutron star (NS) during binary inspiral. They are strongly dependent on…
Discovery and confirmation of the shortest gamma ray burst from a collapsar
Tomas Ahumada, Leo P. Singer, Shreya Anand +54
Gamma-ray bursts (GRBs) are among the brightest and most energetic events in the universe. The duration and hardness distribution of GRBs has two clusters, now understood to reflec…
Accurate flux calibration of GW170817: is the X-ray counterpart on the rise?
E. Troja, B. O'Connor, G. Ryan +7
X-ray emission from the gravitational wave transient GW170817 is well described as non-thermal afterglow radiation produced by a structured relativistic jet viewed off-axis. We sho…
Evidence of extended emission in GRB 181123B and other high-redshift short GRBs
S. Dichiara, E. Troja, P. Beniamini +7
We study the high-energy properties of GRB 181123B, a short gamma-ray burst (sGRB) at redshift 1.75. We show that, despite its nominal short duration with 2 s, t…
Preventing Anomalous Torques in Circumbinary Accretion Simulations
Alexander Dittmann, Geoffrey Ryan
Numerical experiments are the primary method of studying the evolution of circumbinary disks due to the strong nonlinearities involved. Many circumbinary simulations also require t…
A tale of two mergers: constraints on kilonova detection in two short GRBs at z0.5
B. O'Connor, E. Troja, S. Dichiara +15
We present a detailed multi-wavelength analysis of two short Gamma-Ray Bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at and GRB 200522A at $z…
Electromagnetic Emission from a Binary Black Hole Merger Remnant in Plasma: Field Alignment and Plasma Temperature
Bernard J. Kelly, Zachariah B. Etienne, Jacob Golomb +4
Comparable-mass black-hole mergers generically result in moderate to highly spinning holes, whose spacetime curvature will significantly affect nearby matter in observable ways. We…
GRB 160625B: Evidence for a Gaussian-Shaped Jet
Virginia Cunningham, S. Bradley Cenko, Geoffrey Ryan +9
We present multiwavelength modeling of the afterglow from the long gamma-ray burst GRB 160625B using Markov Chain Monte Carlo (MCMC) techniques of the afterglowpy Python package. G…
A thousand days after the merger: continued X-ray emission from GW170817
E. Troja, H. van Eerten, B. Zhang +7
Recent observations with the Chandra X-ray telescope continue to detect X-ray emission from the transient GW170817. In a total exposure of 96.6 ks, performed between March 9 and Ma…
Gamma-Ray Burst Afterglows In The Multi-Messenger Era: Numerical Models and Closure Relations
Geoffrey Ryan, Hendrik van Eerten, Luigi Piro +1
Gamma-ray bursts (GRBs) associated with gravitational wave events are, and will likely continue to be, viewed at a larger inclination than GRBs without gravitational wave detection…
The afterglow and kilonova of the short GRB 160821B
E. Troja, A. J. Castro-Tirado, J. Becerra Gonzalez +22
GRB 160821B is a short duration gamma-ray burst (GRB) detected and localized by the Neil Gehrels Swift Observatory in the outskirts of a spiral galaxy at z=0.1613, at a projected p…
X-ray follow-up of extragalactic transients
Erin Kara, Raffaella Margutti, Azadeh Keivani +11
Most violent and energetic processes in our universe, including mergers of compact objects, explosions of massive stars and extreme accretion events, produce copious amounts of X-r…
A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
L. Piro, E. Troja, B. Zhang +12
Multi-messenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or a neutron star (NS). We show that a long-lived magneti…
A year in the life of GW170817: the rise and fall of a structured jet from a binary neutron star merger
E. Troja, H. van Eerten, G. Ryan +6
We present the results of our year-long afterglow monitoring of GW170817, the first binary neutron star (NS) merger detected by advanced LIGO and advanced Virgo. New observations w…