Detection of ultra-fast radio bursts from FRB 20121102A

Snelders, M. P.; Nimmo, K.; Hessels, J. W. T.; Bensellam, Z.; Zwaan, L. P.; Chawla, P.; Ould-Boukattine, O. S.; Kirsten, F.; Faber, J. T.; Gajjar, V.

doi:10.1038/s41550-023-02101-x

Cited by 12 publications

(1 citation statement)

References 60 publications

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“…On the other side of the spectrum, ref. [43] recently reported the discovery of isolated micro-second duration bursts from FRB20121102A. Such narrow FRBs would be largely averaged out in the data.…”

Section: Expanding the Frb Parameter Spacementioning

confidence: 99%

A Needle in a Cosmic Haystack: A Review of FRB Search Techniques

Rajwade,

van Leeuwen

2024

Universe

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Ephemeral Fast Radio Bursts (FRBs) must be powered by some of the most energetic processes in the Universe. That makes them highly interesting in their own right, and as precise probes for estimating cosmological parameters. This field thus poses a unique challenge: FRBs must be detected promptly and immediately localised and studied based only on that single millisecond-duration flash. The problem is that the burst occurrence is highly unpredictable and that their distance strongly suppresses their brightness. Since the discovery of FRBs in single-dish archival data in 2007, detection software has evolved tremendously. Pipelines now detect bursts in real time within a matter of seconds, operate on interferometers, buffer high-time and frequency resolution data, and issue real-time alerts to other observatories for rapid multi-wavelength follow-up. In this paper, we review the components that comprise a FRB search software pipeline, we discuss the proven techniques that were adopted from pulsar searches, we highlight newer, more efficient techniques for detecting FRBs, and we conclude by discussing the proposed novel future methodologies that may power the search for FRBs in the era of big data astronomy.

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Section: Expanding the Frb Parameter Spacementioning

confidence: 99%

A Needle in a Cosmic Haystack: A Review of FRB Search Techniques

Rajwade,

van Leeuwen

2024

Universe

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Design of Broadband Phased Array Feed Using Stereolithographic Additive Manufacturing Heterogeneous Integrating Technology for Fast Radio Burst Observation

Wang,

Liu,

et al. 2024

Adv Eng Mater

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Herein, a stereolithography appearance 3‐D printed phased array feed (PAF) on radio telescopes based on broadband Vivaldi antenna elements covering 4–10 GHz, which meets the requirements of low cost, lightweight, and compact volume, is designed and proposed. The prototype is integrated with two orthogonal linear polarized 4 × 5 arrays, each of which is composed of 20 Vivaldi antenna elements. The distance between adjacent antenna elements is 1/2 λ in both E‐plane and H‐plane. By increasing thickness of the slice elements compared with traditional end‐fire arrays on printed circuit board, the wide‐band impedance matching is realized. The mutual impedance matrix of the dual‐polarization array is calculated and the equivalent circuit of the active and parasitic elements is demonstrated. Due to the orthogonal parasitic elements inserted between the adjacent active antennas, equivalent capacitance is introduced in the tightly coupled array. The measured active voltage standing wave ratio of the manufactured PAF exhibits 4–10 GHz operating bandwidth for both broadside radiation and 45° scan in both E‐ and H‐plane polarization. The proposed wideband PAF has a promising potential application prospect in fast radio burst and other astronomic observation.

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TransientX: A high-performance single-pulse search package

Men,

Barr

2024

A&A

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Radio interferometers composed of a large array of small antennas posses large fields of view, coupled with high sensitivities. For example, the Karoo Array Telescope (MeerKAT) achieves a gain of up to 2.8 K/Jy across its $>1\ deg ^2$ field of view. This capability significantly enhances the survey speed for pulsars and fast transients. It also introduces challenges related to the high data rate, which reaches a few Tb/s for MeerKAT, and it requires substantial computing power. To handle the high data rate of surveys, we have developed a high-performance single-pulse search software called "TransientX". This software integrates multiple processes into one pipeline, which includes radio-frequency interference mitigation, dedispersion, matched filtering, clustering, and candidate plotting. In TransientX we developed an efficient CPU-based dedispersion implementation using the sub-band dedispersion algorithm. Additionally TransientX employs the density-based spatial clustering of applications with noise (DBSCAN) algorithm to eliminate duplicate candidates, using an efficient implementation based on the kd-tree data structure. We also calculate the decrease of signal-to-noise ratio resulting from dispersion measure, boxcar width, spectral index, and pulse-shape mismatches. Remarkably, we find that the decrease of signal-to-noise ratio resulting from the mismatch between a boxcar-shaped template and a Gaussian-shaped pulse with scattering remains relatively small, at approximately 9<!PCT!>, even when the scattering timescale is ten times that of the pulse width. Additionally, the decrease in the signal-to-noise ratio resulting from the spectral index mismatch becomes significant with multi-octave receivers. We have benchmarked the individual processes, including dedispersion, matched filtering, and clustering. Our dedispersion implementation can be executed in real time using a single CPU core on data with 4096 dispersion measure trials, which consist of 4096 channels and have a time resolution of 153 microseconds. Overall TransientX offers the capability for efficient CPU-only real-time single-pulse searching.

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Detection of ultra-fast radio bursts from FRB 20121102A

Cited by 12 publications

References 60 publications

A Needle in a Cosmic Haystack: A Review of FRB Search Techniques

A Needle in a Cosmic Haystack: A Review of FRB Search Techniques

Design of Broadband Phased Array Feed Using Stereolithographic Additive Manufacturing Heterogeneous Integrating Technology for Fast Radio Burst Observation

TransientX: A high-performance single-pulse search package

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