High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients survey

Abstract We present microsecond-resolution, coherently dedispersed, polarimetric measurements of 35 fast radio bursts (FRBs) detected during the Commensal Real-time ASKAP Fast Transients (CRAFT) incoherent sum (ICS) survey with the Australian Square Kilometre Array Pathfinder (ASKAP). We find a wide diversity of time–frequency morphology and polarisation properties broadly consistent with those of currently known non-repeating FRBs. The high S/N and fine time-resolution of our data however reveals a wealth of new information. Key results include (i) the distribution of scattering timescales, ${{{\unicode{x03C4}}_\textrm{obs}}}$ , is limited purely by instrumental effects, with no downturn at high ${{{\unicode{x03C4}}_\textrm{obs}}}$ as expected from a log-normal distribution; (ii) for the 29 FRBs with known redshift, there is no detectable correlation between ${{{\unicode{x03C4}}_\textrm{obs}}}$ and dispersion measure (DM) fluctuations about the Macquart relation, in contrast to expectations from pulsar scattering–DM relations; (iii) all FRBs probably have multiple components, and at least a large fraction have variable PA, the identification of which is limited by scattering; (iv) at least half of all FRBs exhibit PA microstructure at 200 $\mu{}$ s–200 ns timescales, with behaviour most closely resembling a sub-category of Crab main pulses; (v) that there is a break in the FRB circular polarisation distribution at Stokes $V \gtrsim 20$ %, which is suggestive of a discrete sub-population.

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Publication Details

Journal
Publications of the Astronomical Society of Australia
Published
2025-01-01
DOI
https://doi.org/10.1017/pasa.2025.10103
Citations
3
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
3.46

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article

High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients survey

Mawson W. Sammons, K. Gourdji, Apurba Bera, Clancy W. James et al.
3 citations
Publications of the Astronomical Society of Australia
Pulsars and Gravitational Waves Research
3.46
article

High-time-resolution properties of 35 fast radio bursts detected by the Commensal Real-time ASKAP Fast Transients survey

Mawson W. Sammons, K. Gourdji, Apurba Bera, Clancy W. James, R. M. Shannon, A. T. Deller, Adrian Sutinjo, K. W. Bannister, Marcin Glowacki, D. R. Scott, R. D. Ekers, P. A. Uttarkar, John R. Paterson, Tyson Dial
article en
3 citations

Abstract

Abstract We present microsecond-resolution, coherently dedispersed, polarimetric measurements of 35 fast radio bursts (FRBs) detected during the Commensal Real-time ASKAP Fast Transients (CRAFT) incoherent sum (ICS) survey with the Australian Square Kilometre Array Pathfinder (ASKAP). We find a wide diversity of time–frequency morphology and polarisation properties broadly consistent with those of currently known non-repeating FRBs. The high S/N and fine time-resolution of our data however reveals a wealth of new information. Key results include (i) the distribution of scattering timescales, ${{{\unicode{x03C4}}_\textrm{obs}}}$ , is limited purely by instrumental effects, with no downturn at high ${{{\unicode{x03C4}}_\textrm{obs}}}$ as expected from a log-normal distribution; (ii) for the 29 FRBs with known redshift, there is no detectable correlation between ${{{\unicode{x03C4}}_\textrm{obs}}}$ and dispersion measure (DM) fluctuations about the Macquart relation, in contrast to expectations from pulsar scattering–DM relations; (iii) all FRBs probably have multiple components, and at least a large fraction have variable PA, the identification of which is limited by scattering; (iv) at least half of all FRBs exhibit PA microstructure at 200 $\mu{}$ s–200 ns timescales, with behaviour most closely resembling a sub-category of Crab main pulses; (v) that there is a break in the FRB circular polarisation distribution at Stokes $V \gtrsim 20$ %, which is suggestive of a discrete sub-population.

Publications of the Astronomical Society of AustraliaVol. 42
Commonwealth Scientific and Industrial Research Organisation (AU), Space Science Institute (US), Australia Telescope National Facility (AU), University of Cape Town (ZA), Curtin University (AU), Royal Observatory (GB), Astronomy Australia (AU), McGill University (CA), Swinburne University of Technology (AU), University of Edinburgh (GB)
National Aeronautics and Space Administration, Science and Industry Endowment Fund, Astronomy Australia Limited, Australian Government, Commonwealth Scientific and Industrial Research Organisation, University of Pretoria, Swinburne University of Technology, University of the Western Cape, State Government of Victoria, University of Cape Town, Government of Western Australia, Science and Technology Facilities Council
Openalex Percentile: Top 7%
Pulsars and Gravitational Waves Research
3.46
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