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Accepted manuscript

The Commensal Real-time ASKAP Fast Transient incoherent-sum survey

Published online by Cambridge University Press:  24 January 2025

R. M. Shannon Open the ORCID record for R. M. Shannon [Opens in a new window] ,
K. W. Bannister ,
A. Bera Open the ORCID record for A. Bera [Opens in a new window] ,
S. Bhandari ,
C. K. Day Open the ORCID record for C. K. Day [Opens in a new window] ,
A. T. Deller ,
T. Dial ,
D. Dobie ,
R. D. Ekers  and
W.- f. Fong
...Show all authors
R. M. Shannon*
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
K. W. Bannister
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia Sydney Institute for Astronomy, School of Physics, The University of Sydney, Camperdown, NSW 2006, Australia
A. Bera
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
S. Bhandari
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands Joint institute for VLBI ERIC, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
C. K. Day
Affiliation:
Department of Physics, McGill University, Montreal, Quebec H3A 2T8, Canada
A. T. Deller
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
T. Dial
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
D. Dobie
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia The ARC Centre of Excellence for Gravitational-Wave Discovery (OzGrav)
R. D. Ekers
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
W.- f. Fong
Affiliation:
Center for Interdisciplinary ExplorationandResearch inAstrophysics (CIERA) andDepartment of Physics andAstronomy, Northwestern University, Evanston, IL 60208, USA
M. Glowacki
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
A. C. Gordon
Affiliation:
Center for Interdisciplinary ExplorationandResearch inAstrophysics (CIERA) andDepartment of Physics andAstronomy, Northwestern University, Evanston, IL 60208, USA
K. Gourdji
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
A. Jaini
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
C. W. James
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
P. Kumar
Affiliation:
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 76100 Rehovot, Israel
E. K. Mahony
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia
L. Marnoch
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia School of Mathematical and Physical Sciences, Macquarie University, NSW 2109, Australia Astrophysics and Space Technologies Research Centre, Macquarie University, Sydney, NSW 2109, Australia The ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D)
A. R. Muller
Affiliation:
Maria Mitchell Observatory, Nantucket, MA 02554, USA
J. X. Prochaska
Affiliation:
Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), 5-1-5 Kashiwanoha, Kashiwa, 277-8583, Japan Division of Science, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
H. Qiu (邱昊)
Affiliation:
SKA Observatory, Jodrell Bank, Lower Withington, Macclesfield, SK11 9FT, UK
S. D. Ryder
Affiliation:
School of Mathematical and Physical Sciences, Macquarie University, NSW 2109, Australia Astrophysics and Space Technologies Research Centre, Macquarie University, Sydney, NSW 2109, Australia
E. M. Sadler
Affiliation:
Australia Telescope National Facility, CSIRO Space & Astronomy, Box 76 Epping, NSW 1710, Australia Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006, Australia
D. R. Scott
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia
N. Tejos
Affiliation:
Instituto de Física, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile
P. A. Uttarkar
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
Y. Wang
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, John St., Hawthorn, VIC 3122, Australia
*
Author for correspondence: R. M. Shannon, Email: rshannon@swin.edu.au.
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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 to discover previous-generation narrow-field telescopes. The Commensal Real-time ASKAP Fast Transient (CRAFT) Survey Science Project has developed instrumentation to continuously search for fast radio transients (duration ≲ 1 second) with ASKAP, with a particular focus on finding and localising Fast Radio Bursts (FRBs). Since 2018, the CRAFT survey has been searching for FRBs and other fast transients by incoherently adding the intensities received by individual ASKAP antennas, and then correcting for the impact of frequency dispersion on these short-duration signals in the resultant incoherent sum (ICS) in real-time. This low-latency detection enables the triggering of voltage buffers, which facilitates the localisation of the transient source and the study of spectro-polarimetric properties at high time resolution. Here we report the sample of 43 FRBs discovered in this CRAFT/ICS survey to date. This includes 22 FRBs that had not previously been reported: 16 FRBs localised by ASKAP to. ≲ 1 arcsec and 6 FRBs localised to ∼ 10 arcmin. Of the new arcsecond-localised FRBs, we have identified and characterised host galaxies (and measured redshifts) for 11. The median of all 30 measured host redshifts from the survey to date is z = 0.23. We summarise results from the searches, in particular those contributing to our understanding of the burst progenitors and emission mechanisms, and on the use of bursts as probes of intervening media. We conclude by foreshadowing future FRB surveys with ASKAP using a coherent detection system that is currently being commissioned. This will increase the burst detection rate by a factor of approximately ten and also the distance to which ASKAP can localise FRBs.

Keywords

galaxies: distances and redshiftsstars: generalradio transient source
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Accepted manuscript , pp. 1 - 36
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia

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