230 citations · 778 across the 56 of their papers we have counts for
9 papers · 1 filter
XMM-Newton-discovered Fast X-ray Transients: Host galaxies and limits on contemporaneous detections of optical counterparts
D. Eappachen, P. G. Jonker, J. Quirola-Vásquez +18
Extragalactic fast X-ray transients (FXTs) are a class of soft (0.3-10 keV) X-ray transients lasting a few hundred seconds to several hours. Several progenitor mechanisms have been…
The Galactic neutron star population II -- Systemic velocities and merger locations of binary neutron stars
Nicola Gaspari, Andrew J. Levan, Ashley A. Chrimes +1
The merger locations of binary neutron stars (BNSs) encode their galactic kinematics and provide insights into their connection to short gamma-ray bursts (SGRBs). In this work, we…
Late time HST UV and optical observations of AT~2018cow: extracting a cow from its background
Anne Inkenhaag, Peter G. Jonker, Andrew J. Levan +4
The bright, blue, rapidly evolving AT2018cow is a well-studied peculiar extragalactic transient. Despite an abundance of multi-wavelength data, there still is no consensus on the n…
JWST detection of heavy neutron capture elements in a compact object merger
A. Levan, B. P. Gompertz, O. S. Salafia +80
The mergers of binary compact objects such as neutron stars and black holes are of central interest to several areas of astrophysics, including as the progenitors of gamma-ray burs…
AT2023fhn (the Finch): a Luminous Fast Blue Optical Transient at a large offset from its host galaxy
A. A. Chrimes, P. G. Jonker, A. J. Levan +8
Luminous Fast Blue Optical Transients (LFBOTs) - the prototypical example being AT2018cow - are a rare class of events whose origins are poorly understood. They are characterised b…
Searching for ejected supernova companions in the era of precise proper motion and radial velocity measurements
A. A. Chrimes, A. J. Levan, J. J. Eldridge +7
The majority of massive stars are born in binaries, and most unbind upon the first supernova. With precise proper motion surveys such as Gaia, it is possible to trace back the moti…
A long-duration gamma-ray burst of dynamical origin from the nucleus of an ancient galaxy
Andrew J. Levan, Daniele B. Malesani, Benjamin P. Gompertz +29
The majority of long duration ( s) gamma-ray bursts (GRBs) are believed to arise from the collapse of massive stars \cite{Hjorth+03}, with a small proportion created from the m…
The first JWST spectrum of a GRB afterglow: No bright supernova in observations of the brightest GRB of all time, GRB 221009A
A. J. Levan, G. P. Lamb, B. Schneider +57
We present JWST and Hubble Space Telescope (HST) observations of the afterglow of GRB 221009A, the brightest gamma-ray burst (GRB) ever observed. This includes the first mid-IR spe…
The brightest GRB ever detected: GRB 221009A as a highly luminous event at z = 0.151
D. B. Malesani, A. J. Levan, L. Izzo +39
Context: The extreme luminosity of gamma-ray bursts (GRBs) makes them powerful beacons for studies of the distant Universe. The most luminous bursts are typically detected at moder…