K. W. Bannister
A5027003606- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Particle Accelerators and Free-Electron Lasers
- GNSS positioning and interference
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Statistical and numerical algorithms
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Neutrino Physics Research
- Seismic Imaging and Inversion Techniques
- Seismic Waves and Analysis
Commonwealth Scientific and Industrial Research Organisation
2016-2025
Australia Telescope National Facility
2016-2025
The University of Sydney
2011-2025
Astronomy and Space
2015-2024
Astronomy Australia
2023
ASTRO-3D
2022
ARC Centre of Excellence for All-sky Astrophysics
2013-2022
Gravitational waves have been detected from a binary neutron star merger event, GW170817. The detection of electromagnetic radiation the same source has shown that occurred in outskirts galaxy NGC 4993, at distance 40 megaparsecs Earth. We report counterpart radio appears 16 days after allowing us to diagnose energetics and environment merger. observed emission can be explained by either collimated ultra-relativistic jet viewed off-axis, or cocoon mildly relativistic ejecta. Within 100...
Merging neutron stars offer an exquisite laboratory for simultaneously studying strong-field gravity and matter in extreme environments. We establish the physical association of electromagnetic counterpart EM170817 to gravitational waves (GW170817) detected from merging stars. By synthesizing a panchromatic dataset, we demonstrate that are long-sought production site forging heavy elements by r-process nucleosynthesis. The weak gamma-rays seen dissimilar classical short gamma-ray bursts with...
Pinpointing a single fast radio burst Fast bursts (FRBs) are flashes of emission from distant astronomical sources. Two FRBs known to have repeated, but most last just few milliseconds and never seen again. Most telescopes that sensitive poor angular resolutions, so the FRB host galaxies remain unknown. Bannister et al. used dedicated observing mode on interferometer detect localize nonrepeating 180924, then followed up with optical telescope observations (see Perspective by Petroff). They...
In this paper we describe the system design and capabilities of Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope at conclusion its construction project commencement science operations. ASKAP is one first telescopes to deploy phased array feed (PAF) technology on a large scale, giving it an instantaneous field view that covers 31 square degrees 800 MHz. As two-dimensional 36x12m antennas, with baselines ranging from 22m 6km, also has excellent snapshot imaging capability...
Fast radio bursts (FRBs) are millisecond-duration events thought to originate beyond the Milky Way galaxy. Uncertainty surrounding burst sources, and their propagation through intervening plasma, has limited use as cosmological probes. We report on a mildly dispersed (dispersion measure 266.5+-0.1 pc cm^-3), exceptionally intense (120+-30 Jy), linearly polarized, scintillating (FRB 150807) that we directly localize 9 arcmin^2. Based low Faraday rotation (12.0+-0.7 rad m^-2), infer negligible...
The discovery of the first electromagnetic counterpart to a gravitational wave signal has generated follow-up observations by over 50 facilities world-wide, ushering in new era multi-messenger astronomy. In this paper, we present event GW170817 and its SSS17a/DLT17ck (IAU label AT2017gfo) 14 Australian telescopes partner observatories as part Australian-based Australian-led research programs. We report early- late-time multi-wavelength observations, including optical imaging spectroscopy,...
Abstract We present the localization and host galaxies of one repeating two apparently nonrepeating fast radio bursts (FRBs). FRB 20180301A was detected localized with Karl G. Jansky Very Large Array to a star-forming galaxy at z = 0.3304. FRB20191228A FRB20200906A were by Australian Square Kilometre Pathfinder 0.2430 0.3688, respectively. combine these 13 other well-localized FRBs in literature, analyze properties. find no significant differences properties FRBs. hosts are moderately star...
We constrain the Hubble constant H$_0$ using Fast Radio Burst (FRB) observations from Australian Square Kilometre Array Pathfinder (ASKAP) and Murriyang (Parkes) radio telescopes. use redshift-dispersion measure (`Macquart') relationship, accounting for intrinsic luminosity function, cosmological gas distribution, population evolution, host galaxy contributions to dispersion (DM$_{\rm host}$), observational biases due burst duration telescope beamshape. Using an updated sample of 16 ASKAP...
We present the discovery of as-of-yet non-repeating Fast Radio Burst (FRB), FRB 20210117A, with Australian Square Kilometer Array Pathfinder (ASKAP) as a part Commensal Real-time ASKAP Transients (CRAFT) Survey. The sub-arcsecond localization burst led to identification its host galaxy at $z=0.214(1)$. This redshift is much lower than what would be expected for source dispersion measure (DM) 729 pc cm$^{-3}$, given typical contributions from intergalactic medium and galaxy. Optical...
Abstract We present the first results from a new backend on Australian Square Kilometre Array Pathfinder, Commensal Realtime ASKAP Fast Transient COherent (CRACO) upgrade. CRACO records millisecond time resolution visibility data, and searches for dispersed fast transient signals including radio bursts (FRB), pulsars, ultra-long period objects (ULPO). With can localise events to arcsecond-level precision after detection. Here, we describe system report result sky survey carried out by at...
Abstract With wide-field phased array feed technology, the Australian Square Kilometre Array Pathfinder (ASKAP) is ideally suited to search for seemingly rare radio transient sources that are difficult discover previous-generation narrow-field telescopes. The Commensal Real-time ASKAP Fast Transient (CRAFT) Survey Science Project has developed instrumentation continuously fast transients (duration ≲ 1 second) with ASKAP, a particular focus on finding and localising Radio Bursts (FRBs). Since...
Abstract Fast radio bursts (FRBs) are highly energetic events of short-duration intense emission, the origin which remains elusive. Polarization FRB signals carries information about emission source as well magnetoionic media signal passes through before reaching terrestrial telescopes. Currently known FRBs show a diverse range polarization, sometimes with complex features, making it challenging to describe them in unified model. 20230708A and 20210912A two bright polarized (apparently)...
We report the detection of a dispersed fast radio burst (FRB) in archival intermediate-latitude Parkes Radio Telescope data. The appears to be same physical origin as four purported extragalactic FRBs reported by Thornton et al. This burst's arrival time precedes bursts 10 years. consider that this survey, and many other low-latitude (|gb| < 30°) pulsar surveys, have been searched for but produced fewer detections than comparatively brief search. Such rate dependence on Galactic position...
Combining high time and frequency resolution full-polarisation spectra of Fast Radio Bursts (FRBs) with knowledge their host galaxy properties provides an opportunity to study both the emission mechanism generating them impact propagation through local environment, galaxy, intergalactic medium. The Australian Square Kilometre Array Pathfinder (ASKAP) telescope has provided first ensemble bursts this information. In paper, we present spectral resolution, full polarisation observations five...
Probing a galaxy halo with radio burst Fast bursts (FRBs) are millisecond flashes of emission from distant galaxies. It has only recently become possible to locate single precisely enough determine the host galaxy. Prochaska et al. have observed and localized FRB using interferometer. The line sight coincidentally passes through outskirts closer foreground By analyzing propagation FRB, authors put constraints on density magnetization gas in technique provides complementary information...
We report a new Fast Radio Burst (FRB) discovered in real-time as part of the UTMOST project at Molonglo Observatory Synthesis Telescope (MOST). FRB170827 is first detected with our low-latency ($< 24$ s), machine-learning-based FRB detection system. The discovery was accompanied by capture voltage data native time and frequency resolution observing system, enabling coherent dedispersion detailed off-line analysis, which have unveiled fine temporal structure. dispersion measure (DM) 176.80...
We have developed a new coherent dedispersion mode to study the emission of Fast Radio Bursts that trigger voltage capture capability Australian SKA Pathfinder (ASKAP) interferometer. In principle can probe timescales down 3 ns with full polarimetric information preserved. Enabled by capability, here we present spectropolarimetric analysis FRB 181112 detected ASKAP, localized galaxy at redshift 0.47. At microsecond time resolution burst is resolved into four narrow pulses rise just $15 \mu$s...
We report the detection of an ultra-bright fast radio burst (FRB) from a modest, 3.4-day pilot survey with Australian Square Kilometre Array Pathfinder. The was conducted in wide-field fly's-eye configuration using phased-array-feed technology deployed on array to instantaneously observe effective area $160$ deg$^2$, and achieve exposure totaling $13200$ deg$^2$ hr. constrain position FRB 170107 region $8'\times8'$ size (90% containment) its fluence be $58\pm6$ Jy ms. spectrum shows sharp...
We develop a sophisticated model of FRB observations, accounting for the intrinsic cosmological gas distribution and host galaxy contributions, give most detailed account yet observational biases due to burst width, dispersion measure, exact telescope beamshape. Our results offer significant increase in both accuracy precision beyond those previously obtained. Using from ASKAP Parkes, we present our best-fit population parameters companion paper. Here, consider detail expected fitted...
ABSTRACT Fast radio bursts (FRBs) are extremely powerful sources of waves observed at cosmological distances. We use a sophisticated model FRB observations – presented in detail companion paper to fit population parameters using large samples FRBs detected by ASKAP and Parkes, including seven with confirmed host galaxies. Our fitted demonstrate that the evolves redshift manner consistent with, or faster than, star formation rate (SFR), ruling out non-evolving better than 98 per cent CL...
Fast radio bursts (FRBs) are millisecond-duration pulses of emission originating from extragalactic distances. Radio dispersion is imparted on each burst by intervening plasma, mostly located in the intergalactic medium. In this work, we observe FRB 20220610A and localize it to a morphologically complex host galaxy system at redshift 1.016 ± 0.002. The measure consistent with passage through substantial column plasma medium extend relationship between those quantities measured lower...