Eighteen new fast radio bursts in the High Time Resolution Universe survey
M. Trudu, A. Possenti, M. Pilia, M. Bailes, E. F. Keane, M. Kramer, V., Balakrishnan, S. Bhandari, N. D. R. Bhat, M. Burgay, A. Cameron, D. J., Champion, A. Jameson, S. Johnston, M. J. Keith, L. Levin, C. Ng, R. Sengar, and C. Tiburzi

TL;DR
This study demonstrates that sub-banded search techniques significantly improve the detection efficiency of fast radio bursts, leading to the discovery of eighteen new FRBs in the HTRU survey and highlighting the importance of bandwidth-specific search methods.
Contribution
The paper introduces and validates the effectiveness of sub-banded search methods for FRB detection, resulting in a substantial increase in detected bursts and improved search efficiency.
Findings
Sub-banded searches increase detection efficiency by up to 1433%.
Eighteen new FRBs were confidently detected in the HTRU survey.
Sub-banded techniques mitigate noise impact, enhancing signal detection.
Abstract
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 ultra-wideband receivers featuring GHz-scale observational bandwidths, this approach may overlook a significant number of events. We investigate the efficacy of sub-banded searches for FRBs, a technique seeking bursts within limited portions of the bandwidth. These searches aim to enhance the significance of FRB detections by mitigating the impact of noise outside the targeted frequency range, thereby improving signal-to-noise ratios. We conducted a series of Monte Carlo simulations, for the -MHz bandwidth Parkes 21-cm multi-beam (PMB) receiver system and the Parkes Ultra-Wideband Low (UWL) receiver,…
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