M. Sokołowski
A5016519688- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Antenna Design and Optimization
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- SAS software applications and methods
- Astro and Planetary Science
- CCD and CMOS Imaging Sensors
- Adaptive optics and wavefront sensing
- Astrophysical Phenomena and Observations
- Quantum Chromodynamics and Particle Interactions
- Radio Wave Propagation Studies
- High-Energy Particle Collisions Research
- Superconducting and THz Device Technology
- Electromagnetic Compatibility and Measurements
- Particle physics theoretical and experimental studies
- GNSS positioning and interference
- History and Developments in Astronomy
- Space Satellite Systems and Control
- Geophysics and Gravity Measurements
- Galaxies: Formation, Evolution, Phenomena
- Nuclear Physics and Applications
Curtin University
2015-2024
International Centre for Radio Astronomy Research
2015-2024
University of Warsaw
2005-2021
Institute of Radio Astronomy
2021
National Centre for Nuclear Research
2009-2020
ARC Centre of Excellence for All-sky Astrophysics
2013-2020
European Union
2019
Polish Institute of International Affairs
2018
Adam Mickiewicz University in Poznań
2018
The University of Sydney
2017
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 The redshifted 21cm line of neutral hydrogen ( Hi ), potentially observable at low radio frequencies (~50–200 MHz), should be a powerful probe the physical conditions inter-galactic medium during Cosmic Dawn and Epoch Reionisation (EoR). sky-averaged signal is expected to extremely weak (~100 mK) in comparison foreground up 10 4 K lowest interest. detection such requires an stable, well characterised system good understanding foregrounds. Development nearly perfectly (~mK accuracy)...
We report characterization results for an engineering prototype of a next-generation low-frequency radio astronomy array. This prototype, which we refer to as the Aperture Array Verification System 0.5 (AAVS0.5), is sparse pseudo-random array 16 log-periodic antennas designed 70-450 MHz. It co-located with Murchison Widefield (MWA) at Radioastronomy Observatory (MRO) near Australian Square Kilometre (SKA) core site. characterize AAVS0.5 using two methods: in-situ interferometry astronomical...
The Murchison Widefield Array (MWA), located in Western Australia, is one of the low-frequency precursors international Square Kilometre (SKA) project. In addition to pursuing its own ambitious science program, it also a testbed for wide range future SKA activities ranging from hardware, software data analysis. key programs MWA and require very high dynamic ranges, which challenges calibration imaging systems. Correct instrument accurate measurements source flux densities polarisations...
Abstract It has been proposed that coherent radio emission could be emitted during or shortly following a gamma-ray burst (GRB). Here we present low-frequency (170–200 MHz) search for pulses associated with long-duration GRBs using the Murchison Widefield Array (MWA). The MWA, its rapid-response system, is capable of performing GRB follow-up observations within approximately 30 s. Our single pulse search, temporal and spectral resolutions 100 μ s 10 kHz, covers dispersion measures up to 5000...
Abstract We present techniques developed to calibrate and correct Murchison Widefield Array low-frequency (72–300 MHz) radio observations for polarimetry. The extremely wide field-of-view, excellent instantaneous ( u , v )-coverage sensitivity degree-scale structure that the provides enable instrumental calibration, removal of artefacts, correction ionospheric Faraday rotation through imaging techniques. With demonstrated polarimetric capabilities Array, we discuss future directions science...
It has been proposed that coherent radio emission could be emitted during or shortly following a gamma-ray burst (GRB). Here we present low-frequency ($170-200$ MHz) search for pulses associated with long-duration GRBs using the Murchison Widefield Array (MWA). The MWA, its rapid-response system, is capable of performing GRB follow-up observations within approximately $30$ seconds. Our single pulse search, temporal and spectral resolutions $100\ \mu$s $10$ kHz, covers dispersion measures up...
The $\mathrm{pp}\ensuremath{\rightarrow}\mathrm{pp}{\ensuremath{\eta}}^{\ensuremath{'}}(958)$ reaction has been measured at the cooler synchrotron COSY J\"ulich using internal beam and COSY-11 facility. total cross sections four different excess energies $Q\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.5,1.7,2.9$, $4.1\mathrm{MeV}$ have evaluated to be...
Abstract The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying the low-frequency (80–300 MHz) southern sky. Since beginning operations in mid-2013, MWA has opened a new observational window hemisphere enabling many science areas. driving objectives of original design were observe 21 cm radiation from Epoch Reionisation (EoR), explore radio time domain, perform Galactic and extragalactic surveys, monitor solar, heliospheric, ionospheric phenomena. All together...
Context. Intended and unintended radio emissions from satellites can interfere with sensitive telescopes in the frequency ranges of key experiments astrophysics cosmology. We detect strong intended electromagnetic radiation Starlink at site future SKA-Low facility Western Australia, using an prototype station known as Engineering Development Array version 2 (EDA2). Aims. aim to show that are easily detectable utilising a configuration low antennas representative ‘station’ our results...
The design and development process for the Square Kilometre Array (SKA) radio telescope’s Low Frequency Aperture component was progressed during SKA pre-construction phase by an international consortium, with goal of meeting requirements a critical review. As part full-sized prototype ‘station’ deployed – Verification System 1 (AAVS1). We provide system overview describe commissioning results AAVS1, which is low frequency telescope 256 dual-polarisation log-periodic dipole antennas working...
The low frequency component of the Square Kilometre Array (SKA1-Low) will be an aperture phased array located at Murchison Radio-astronomy Observatory (MRO) site in Western Australia. It composed 512 stations, each consisting 256 log-periodic dual-polarized antennas, and operate range (50 to 350 MHz) SKA bandwidth. Aperture Verification System 2 (AAVS2), operational since late 2019, is last full-size engineering prototype station deployed MRO before start SKA1-Low construction phase. aim...
Abstract We present an overview of the Southern-sky MWA Rapid Two-metre (SMART) pulsar survey that exploits Murchison Widefield Array’s large field view and voltage-capture system to sky south 30 $^{\circ}$ in declination for pulsars fast transients 140–170 MHz band. The is enabled by advent Phase II MWA’s compact configuration, which offers enormous efficiency beam-forming processing costs, thereby making all-sky this magnitude tractable with MWA. Even long dwell times employed (4800 s),...
We present the results of a coordinated campaign conducted with Murchison Widefield Array (MWA) to shadow Fast Radio Bursts (FRBs) detected by Australian Square Kilometre Pathfinder (ASKAP) at 1.4 GHz, which resulted in simultaneous MWA observations seven ASKAP FRBs. de-dispersed $24$ $\times$ $1.28$ MHz images across $170-200$ band taken 0.5 second time resolution known dispersion measures (DMs) and arrival times bursts searched both within error regions (typically $\sim$ $10$ arcmin...
The redshifted 21cm line of neutral hydrogen (Hi), potentially observable at low radio frequencies (~50-200 MHz), is a promising probe the physical conditions inter-galactic medium during Cosmic Dawn and Epoch Reionisation (EoR). sky-averaged Hi signal expected to be extremely weak (~100 mK) in comparison Galactic foreground emission (~$10^4$ K). Moreover, spectra measured by ground-based instruments are affected chromatic propagation effects (of order tens Kelvins) originating ionosphere....
Many theories predict the existence of very heavy compact objects, that in terms sizes would belong to realms nuclear or atomic physics, but masses could extend macroscopic world, reaching kilograms, tonnes, more. If they exist, it is likely reach our planet with high speeds and cross atmosphere. Because their mass-to-size ratio huge energy, many cases, leave behind a trail form sound seismic waves, etches, light transparent media. Here we show results search for such objects visual...
The Square Kilometre Array telescope at low-frequency (SKA-Low) will be a phased array supporting wide range of science cases covering the frequency band 50 - 350 MHz, while same time asking for high sensitivity and excellent characteristics. These extremely challenging requirements resulted in design using 512 groups 256 log periodic dual polarized antennas each (where group is called "station"), total 131072 antennas. stations are randomly distributed mostly within dense area around centre...
Here we present stringent low-frequency 185MHz limits on coherent radio emission associated with a short gamma-ray burst (SGRB). Our observations of the GRB 180805A were taken upgraded Murchison Widefield Array (MWA) rapid-response system, which triggered within 20s receiving transient alert from Swift, corresponding to 83.7s post-burst. The SGRB was observed for 30m, resulting in 3sigma persistent flux density upper-limit 40.2mJy/beam. Transient searches conducted at Swift position this...
Abstract On June 19, 2020 at 20:05:07 UTC, a fireball lasting was observed above Western Australia by three Desert Fireball Network observatories. The meteoroid entered the atmosphere with speed of km and followed ° slope trajectory from height 75 down to 18.6 km. Despite poor angle triangulated planes between observatories (29°) large distance observatories, well‐constrained kilo‐size main mass predicted have fallen just south Madura in Australia. However, search area be due uncertainties....