A. Shearer
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View article: Long-term monitoring of FRB 20121102A with the Nançay Radio Telescope and multiwavelength campaigns including <i>INTEGRAL</i>
Long-term monitoring of FRB 20121102A with the Nançay Radio Telescope and multiwavelength campaigns including <i>INTEGRAL</i> Open
Context. The origin(s) of fast radio bursts (FRBs), mysterious radio bursts coming from extragalactic distances, remains unknown. Multiwavelength observations are arguably the only way to answer this question unambiguously. Aims. We attemp…
View article: OP06.07: Classification of ovarian masses in the pediatric and adolescent gynecology: a systematic review
OP06.07: Classification of ovarian masses in the pediatric and adolescent gynecology: a systematic review Open
status: Published
View article: Energy-sensitive detectors for astronomy: Past, present and future
Energy-sensitive detectors for astronomy: Past, present and future Open
This review encompasses the current state of development of optical/IR energy-sensitive detectors with reference to both the earliest implementations of energy sensitive detector technology, and current development projects with a discussi…
View article: INTEGRAL and radio joint programme of FRB121102 during a renewed activity
INTEGRAL and radio joint programme of FRB121102 during a renewed activity Open
Here we report on a renewed activity of the repeating fast radio burst FRB121102. During an on-going programme involving the INTEGRAL satellite in hard X-rays, the Arecibo, Effelsberg, and the Nan & ccedil;ay radio telescopes, several radi…
View article: Fifty years of High Time Resolution Astrophysics at La Silla : results and prospects
Fifty years of High Time Resolution Astrophysics at La Silla : results and prospects Open
High time-resolution astrophysics (HTRA) involves observations and studies of cosmic sources on timescales of seconds to sub-milliseconds. Indeed, this observing tool gives access to information on a wide variety of astronomical objects fr…
View article: The First Ultraviolet Detection of the Large Magellanic Cloud Pulsar PSR B0540–69 and Its Multi-wavelength Properties
The First Ultraviolet Detection of the Large Magellanic Cloud Pulsar PSR B0540–69 and Its Multi-wavelength Properties Open
We observed the young (∼1700 yr) pulsar PSR B0540−69 in the ultraviolet for the first time with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope . Imaging observations with the NUV-MAMA and ultraviolet FUV-MAMA …
View article: Comparison of Planer Dose Equilibrium and Computed Tomography Dose Index and Implications for Reported Patient Dose Information
Comparison of Planer Dose Equilibrium and Computed Tomography Dose Index and Implications for Reported Patient Dose Information Open
Technical developments are ongoing in CT, and there has been a continually increasing trend in patient prescription, resulting in increased exposure. Currently, doses delivered during CT are generally evaluated using computed tomography do…
View article: The first ultraviolet detection of the Large Magellanic Cloud pulsar PSR B0540-69
The first ultraviolet detection of the Large Magellanic Cloud pulsar PSR B0540-69 Open
We observed the young ($\sim 1700$ yrs) pulsar PSR B0540-69 in the near-ultraviolet (UV) for the first time with the Space Telescope Imaging Spectrograph (STIS) aboard the {\em Hubble Space Telescope}. Imaging observations with the NUV- an…
View article: Asteroid Day: a vehicle for raising public awareness of astronomy and space exploration among primary students in Ireland
Asteroid Day: a vehicle for raising public awareness of astronomy and space exploration among primary students in Ireland Open
Asteroid Day is a global awareness campaign which takes place annually to learn about asteroids, their impact and to increase awareness on how we can protect the Earth from future asteroid impacts. At the event students tested their own hy…
View article: CT Output Dose Performance-Conventional Approach versus the Dose Equilibrium Method
CT Output Dose Performance-Conventional Approach versus the Dose Equilibrium Method Open
Current output dose measurement in CT is based on (CTDI). The conventional methodology of CT dosimetric performance characterization is not appropriate to modern CT scanners with helical scanning modes, dose modulation, array detectors and…
View article: Optical pulsars and polarimetry
Optical pulsars and polarimetry Open
Despite the early optical detection of the Crab pulsar in 1969, optical pulsars have become the poor cousin of the neutron star family. Only five normal pulsars have been observed to pulse in the optical waveband. A further three magnetars…
View article: High Time Resolution Astronomical Polarimetry with GASP
High Time Resolution Astronomical Polarimetry with GASP Open
The Galway Astronomical Stokes Polarimeter (GASP) is a high time resolution, full-Stokes imaging polarimeter which utilises a Fresnel rhomb prism as a beam-splitter and quarter wave retarder. The ability to perform optical photometry and p…
View article: New hard X-rays and optical polarimetric observations of the Crab nebula and pulsar
New hard X-rays and optical polarimetric observations of the Crab nebula and pulsar Open
Polarisation is a powerful tool to study compact objects where high-energy particle acceleration processes and magnetic fields play a major role. Joining optical and high-energy polarisation data, whilst challenging, should develop a bette…
View article: Searching for the optical counterparts of two young γ-ray pulsars
Searching for the optical counterparts of two young γ-ray pulsars Open
We report on the first deep optical observations of two gamma-ray pulsars, both among the very first discovered by the Fermi Gamma-ray Space Telescope. The two pulsars are the radio-loud PSR J1907+0602 in the TeV pulsar wind nebula (PWN) M…
View article: Observations of three young γ-ray pulsars with the Gran Telescopio Canarias
Observations of three young γ-ray pulsars with the Gran Telescopio Canarias Open
We report the analysis of the first deep optical observations of three isolated γ-ray pulsars detected by the Fermi Gamma-ray Space Telescope: the radio-loud PSR J0248+6021 and PSR J0631+1036, and the radio-quiet PSR J0633+0632. The latter…
View article: A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar
A recent change in the optical and γ-ray polarization of the Crab nebula and pulsar Open
We report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubble Space Telescope, Advanced Camera for Surveys and the Inte…
View article: VLT polarimetry observations of the middle-aged pulsar PSR B0656+14
VLT polarimetry observations of the middle-aged pulsar PSR B0656+14 Open
\n Context. Optical polarisation measurements are key tests for different models of the pulsar magnetosphere. Furthermore, comparing the relative orientation of the phase-averaged linear polarisation direction and the pulsar proper motion …
View article: Circular polarization of synchrotron radiation in high magnetic fields
Circular polarization of synchrotron radiation in high magnetic fields Open
The general model for incoherent synchrotron radiation has long been known, with the first theory being published by Westfold in 1959 and continued by Westfold and Legg in 1968. When this model was first developed, it was applied to radiat…
View article: The study of neutron star magnetospheres with LOFT
The study of neutron star magnetospheres with LOFT Open
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT for the study of magnetospheres of isolated neutron stars. F…