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Accepted manuscript

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

Published online by Cambridge University Press:  01 October 2025

D. R. Scott ,
T. Dial ,
A. Bera Open the ORCID record for A. Bera [Opens in a new window] ,
A. T. Deller ,
M. Glowacki Open the ORCID record for M. Glowacki [Opens in a new window] ,
K. Gourdji ,
C. W. James Open the ORCID record for C. W. James [Opens in a new window] ,
R. M. Shannon Open the ORCID record for R. M. Shannon [Opens in a new window] ,
K. W. Bannister  and
R. D. Ekers
...Show all authors
D. R. Scott
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia
T. Dial
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, 3122, VIC, Australia
A. Bera
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia
A. T. Deller
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, 3122, VIC, Australia
M. Glowacki
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh, EH9 3HJ, United Kingdom Inter-University Institute for Data Intensive Astronomy, Department of Astronomy, University of Cape Town, Cape Town, South Africa
K. Gourdji
Affiliation:
CSIRO Space and Astronomy, Australia Telescope National Facility, PO Box 76, Epping, 1710, NSW, Australia
C. W. James*
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia
R. M. Shannon
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, 3122, VIC, Australia
K. W. Bannister
Affiliation:
CSIRO Space and Astronomy, Australia Telescope National Facility, PO Box 76, Epping, 1710, NSW, Australia
R. D. Ekers
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia CSIRO Space and Astronomy, Australia Telescope National Facility, PO Box 76, Epping, 1710, NSW, Australia
J. Paterson
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia
M. Sammons
Affiliation:
Department of Physics, McGill University, 3600 rue University, Montréal, QC H3A 2T8, Canada Trottier Space Institute, McGill University, 3550 rue University, Montréal, QC H3A 2A7, Canada
A. T. Sutinjo
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, Bentley, 6102, WA, Australia
P. A. Uttarkar
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
*
Author for correspondence: Clancy W. James, Email: clancy.james@curtin.edu.au.
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Abstract

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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, τobs, is limited purely by instrumental effects, with no downturn at high τobs as expected from a log-normal distribution; (ii) for the 29 FRBs with known redshift, there is no detectable correlation between τobs 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 µs–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 ≳ 20%, which is suggestive of a discrete sub-population.

Keywords

radio transient sourcesradio bursts

Information

Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 26
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia