Eighteen new fast radio bursts in the High Time Resolution Universe survey

Context. Current observational evidence reveals that fast radio bursts (FRBs) exhibit bandwidths ranging from a few dozen MHz to several GHz. Traditional FRB searches primarily employ matched filter methods on time series collapsed across the entire observational bandwidth. However, with modern ultrawideband receivers featuring gigahertz-scale observational bandwidths, this approach may overlook a significant number of events. Aims. We investigate the efficacy of sub-banded searches for FRBs, whereby we look for bursts within limited portions of the bandwidth. The aim of these searches is to enhance the significance of FRB detections by mitigating the impact of noise outside the targeted frequency range, thereby improving signal-to-noise ratios. Methods. We conducted a series of Monte Carlo simulations for the 400-MHz bandwidth Parkes 21-cm multi-beam (PMB) receiver system and the Parkes Ultra-Wideband Low (UWL) receiver, simulating bursts down to frequency widths of about 100 MHz. Additionally, we performed a complete reprocessing of the high-latitude segment of the High Time Resolution Universe South survey (HTRU-S) of the Parkes-Murriyang telescope using sub-banded search techniques. Results. Simulations reveal that a sub-banded search can enhance the burst search efficiency by 67 −42 +133 % for the PMB system and 1433 −126 +143 % for the UWL receiver. Furthermore, the reprocessing of HTRU led to the confident detection of 18 new bursts, nearly tripling the count of FRBs found in this survey. Conclusions. These results underscore the importance of employing sub-banded search methodologies to effectively address the often modest spectral occupancy of these signals.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-09-02
DOI
https://doi.org/10.1051/0004-6361/202450775
Citations
1
Primary Topic
Pulsars and Gravitational Waves Research
Type
article
Field-Weighted Citation Impact
0.33

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article

Eighteen new fast radio bursts in the High Time Resolution Universe survey

M. Krämer, D. J. Champion, M. Pilia, C. Tiburzi et al.
1 citations
Astronomy and Astrophysics
Pulsars and Gravitational Waves Research
0.33
article

Eighteen new fast radio bursts in the High Time Resolution Universe survey

M. Krämer, D. J. Champion, M. Pilia, C. Tiburzi, L. Levin, A. Possenti, N. D. R. Bhat, A. Jameson, Rahul Sengar, S. Johnston, E. F. Keane, V. Balakrishnan, A D Cameron, M. Burgay, M. J. Keith, M. Bailes, M. Trudu, Cherry Ng, Shivani Bhandari
article en
1 citations

Abstract

Context. Current observational evidence reveals that fast radio bursts (FRBs) exhibit bandwidths ranging from a few dozen MHz to several GHz. Traditional FRB searches primarily employ matched filter methods on time series collapsed across the entire observational bandwidth. However, with modern ultrawideband receivers featuring gigahertz-scale observational bandwidths, this approach may overlook a significant number of events. Aims. We investigate the efficacy of sub-banded searches for FRBs, whereby we look for bursts within limited portions of the bandwidth. The aim of these searches is to enhance the significance of FRB detections by mitigating the impact of noise outside the targeted frequency range, thereby improving signal-to-noise ratios. Methods. We conducted a series of Monte Carlo simulations for the 400-MHz bandwidth Parkes 21-cm multi-beam (PMB) receiver system and the Parkes Ultra-Wideband Low (UWL) receiver, simulating bursts down to frequency widths of about 100 MHz. Additionally, we performed a complete reprocessing of the high-latitude segment of the High Time Resolution Universe South survey (HTRU-S) of the Parkes-Murriyang telescope using sub-banded search techniques. Results. Simulations reveal that a sub-banded search can enhance the burst search efficiency by 67 −42 +133 % for the PMB system and 1433 −126 +143 % for the UWL receiver. Furthermore, the reprocessing of HTRU led to the confident detection of 18 new bursts, nearly tripling the count of FRBs found in this survey. Conclusions. These results underscore the importance of employing sub-banded search methodologies to effectively address the often modest spectral occupancy of these signals.

Astronomy and AstrophysicsVol. 690
Université d'Orléans (FR), Commonwealth Scientific and Industrial Research Organisation (AU), Centre National de la Recherche Scientifique (FR), Australia Telescope National Facility (AU), Trinity College Dublin (IE), Curtin University (AU), University of Manchester (GB), ARC Centre of Excellence for Gravitational Wave Discovery (AU), Astronomy and Space (AU), Osservatorio Astronomico di Cagliari (IT), Max Planck Institute for Radio Astronomy (DE), International Centre for Radio Astronomy Research (AU), University of Wisconsin–Milwaukee (US), Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (FR), Swinburne University of Technology (AU), Joint Institute for VLBI ERIC (NL), University of Amsterdam (NL), Netherlands Institute for Radio Astronomy (NL)
Australian Government, Commonwealth Scientific and Industrial Research Organisation, Swinburne University of Technology, Science and Technology Facilities Council
Openalex Percentile: Top 35%
Pulsars and Gravitational Waves Research
0.33
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