A5052762901- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Particle Detector Development and Performance
- Food Quality and Safety Studies
- Probiotics and Fermented Foods
- Microbial Metabolites in Food Biotechnology
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Statistical and numerical algorithms
- Methane Hydrates and Related Phenomena
- Advanced X-ray and CT Imaging
- Planetary Science and Exploration
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- High-pressure geophysics and materials
University of the Virgin Islands
2016-2025
The University of Western Australia
2019-2025
ARC Centre of Excellence for Gravitational Wave Discovery
2019-2025
Uganda Wildlife Authority
2023
Observatoire de la Côte d’Azur
2013-2021
Centre National de la Recherche Scientifique
2008-2021
Australian Research Council
2020-2021
Swinburne University of Technology
2020
United States Virgin Islands Department of Health
2016-2019
National Institute for Astrophysics
2005-2018
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,...
We present optical, X-ray and gamma-ray observations of GRB 111209A, observed at a redshift z = 0.677. show that this event was active in its prompt phase for about 25000 s, making it the longest burst ever observed. This rare could have been detected up to ∼ 1.4 gamma-rays. Compared other long bursts (GRBs), 111209A is clear outlier energy-fluence duration plane. The high-energy emission shows no sign strong blackbody component, signature tidal disruption event, or supernova shock breakout....
Short gamma-ray bursts (SGRBs) observed by Swift potentially reveal the first insight into cataclysmic compact object mergers. To ultimately acquire a fundamental understanding of these events requires pan-spectral observations and knowledge their spatial distribution to differentiate between proposed progenitor populations. Up 2012 April, there are only some 30 per cent SGRBs with reasonably firm redshifts, this sample is highly biased limited sensitivity detect SGRBs. We account for...
Abstract The Australian Square Kilometre Array Pathfinder (ASKAP) will give us an unprecedented opportunity to investigate the transient sky at radio wavelengths. In this paper we present VAST, ASKAP survey for Variables and Slow Transients. VAST exploit wide-field capabilities of enable discovery investigation variable phenomena from local cosmological, including flare stars, intermittent pulsars, X-ray binaries, magnetars, extreme scattering events, interstellar scintillation, supernovae,...
ABSTRACT GRANDMA (Global Rapid Advanced Network Devoted to the Multi-messenger Addicts) is a network of 25 telescopes different sizes, including both photometric and spectroscopic facilities. The aims coordinate follow-up observations gravitational-wave (GW) candidate alerts, especially those with large localization uncertainties, reduce delay between initial detection optical confirmation. In this paper, we detail GRANDMA’s observational performance during LIGO/Advanced Virgo Observing Run...
The "ultra-long" gamma-ray burst GRB 111209A at redshift z = 0.677 is the longest ever observed thus far, with a rest frame prompt emission duration of ∼4 hr. In order to explain exceptional longevity, low-metallicity blue supergiant progenitor was invoked. this article we further constrain phenomenology and properties peculiar by performing multiband temporal spectral analysis both afterglow emission. We use proprietary publicly available data from Swift, Konus WIND, XMM-Newton, TAROT, as...
We present the Global Rapid Advanced Network Devoted to Multi-messenger Addicts (GRANDMA). The network consists of 21 telescopes with both photometric and spectroscopic facilities. They are connected together thanks a dedicated infrastructure. aims at coordinating observations large sky position estimates transient events enhance their follow-up reduce delay between initial detection optical confirmation. GRANDMA program mainly focuses on gravitational-wave alerts find characterise...
Studies of solar radio bursts play an important role in understanding the dynamics and acceleration processes behind space weather events, influence magnetic activity on system planets. Similar low-frequency detected from active M-dwarfs are expected to probe their environments therefore habitability planetary companions. Active produce frequent, powerful flares which, along with emission, reveal conditions within atmospheres. However, date, only one candidate solar-like coherent burst has...
The Télescopes à Action Rapide pour les Objets Transitoires telescopes are two robotic observatories designed to observe the prompt optical emission counterpart and early afterglow of gamma-ray bursts (GRBs). We present data acquired between 2001 2008 discuss properties GRBs, noting various interesting results. observed during GRB phase is rarely very bright: we estimate that 5%–20% GRBs exhibit a bright flash (R < 14) emission, more than 50% have an fainter R = 15.5 when active. study...
The Advanced Virgo interferometer is the upgraded version of detector having goal to extend by a factor 10 observation horizon in universe and consequently increase detection rate three orders magnitude. Its installation progress expected be completed late 2015. In this proceeding we will present scheme main challenging technical features give an outline status foreseen time schedule which bring its full operation.
GRB 130925A is a peculiar event characterized by an extremely long gamma-ray duration ($\approx$7 ks), as well dramatic flaring in the X-rays for $\approx$20 ks. After this period, its X-ray afterglow shows atypical soft spectrum with photon index $\Gamma$$\sim$4, observed Swift and Chandra, until $\approx 10^7$ s, when XMM-Newton observations uncover harder spectral shape $\Gamma$$\sim$2.5, commonly afterglows. We find that two distinct emission components are needed to explain...
Abstract Gravitational waves from coalescing neutron stars encode information about nuclear matter at extreme densities, inaccessible by laboratory experiments. The late inspiral is influenced the presence of tides, which depend on star equation state. Neutron mergers are expected to often produce rapidly rotating remnant that emit gravitational waves. These will provide clues extremely hot post-merger environment. This signature in contains most 2–4 kHz frequency band, outside sensitive...
ABSTRACT We present the largest optical photometry compilation of gamma-ray bursts (GRBs) with redshifts (z). include 64813 observations 535 events (including upper limits) from 28 February 1997 to 18 August 2023. also a user-friendly web tool grbLC which allows users visualize photometry, coordinates, redshift, host galaxy extinction, and spectral indices for each event in our database. Furthermore, we have added Gamma-ray Coordinate Network (GCN) scraper that can be used collect data by...
Abstract Compact binary mergers detectable in gravitational waves can be accompanied by a kilonova, an electromagnetic transient powered radioactive decay of newly synthesised r-process elements. A few kilonova candidates have been observed during short gamma-ray burst follow-up, and one found associated with wave detection, GW170817. However, robust are yet to un-triggered, wide-field optical surveys; search not requiring initial or trigger. Here we present the first observing run for...
We employ realistic constraints on astrophysical and instrumental selection effects to model the Gamma-Ray Burst (GRB) redshift distribution using {\it Swift} triggered samples acquired from optical afterglows (OA) TOUGH survey. Models for Malmquist bias, desert, fraction of missing because host galaxy dust extinction, are used show how "true" GRB is distorted its presently observed biased distribution. also investigate another effect arising a correlation between $E_{{\rm iso}}$ $L_{{\rm...
The discovery of a number gamma-ray bursts (GRBs) with duration exceeding 1000 s has opened the debate on whether these form new class sources, so-called ultra-long GRBs, or if they are rather tail distribution standard long GRB duration. Using sample detected by Swift, we investigate statistical properties GRBs and compare them burst properties. We compute using start epoch "steep decay" phase Swift/XRT. discuss also differences observed in their spectral find that statistically different...
We report on a deep XMM-Newton EPIC observation of the globular cluster Omega Cen performed August 13th, 2001. have detected 11 and 27 faint X-ray sources in core half mass radii, searching down to luminosity 1.3 x 10^{31} erg s^{-1} 0.5-5 keV range. Most bolometric luminosities between ~ 10^{31}-10^{32} s^{-1}. present color-color hardness-intensity diagrams source sample, as well high-quality spectra brightest objects field; including two candidate Cataclysmic Variables (CVs) quiescent...
We present the catalog of X-ray afterglow observed by BeppoSAX from launch satellite to end mission. Thirty-three afterglows out 39 observations were securely identified based on their fading behavior. have extracted continuum parameters (decay index, spectral flux, absorption) for all available afterglows. point a possible correlation between luminosity and energy emitted during prompt γ-ray event. do not detect significant jet signature within afterglows, implying lower limit beaming...