The Commensal Real-Time ASKAP Fast-Transients (CRAFT) Survey

Macquart, Jean–Pierre; Bailes, M.; Bhat, N. D. R.; Bower, Geoffrey C.; Bunton, John D.; Chatterjee, Shami; Colegate, T.; Cordes, J. M.; D'Addario, Larry R.; Deller, Adam T.; Dodson, Richard; Fender, R. P.; Haines, Karen; Halll, P.; Harris, C.J.; Hotan, A. W.; Jonston, S.; Jones, D. L.; Keith, Michael; Koay, Jun Yi; Lazio, T. Joseph W.; Majid, Walid A.; Murphy, Tara; Navarro, Robert; Phillips, Chris; Quinn, Peter J.; Preston, R. A.; Stansby, Bruce; Stairs, I. H.; Stappers, B. W.; Staveley‐Smith, L.; Tingay, S. J.; Thompson, David R.; Straten, W. van; Wagstaff, Kiri L.; Warren, Michael S.; Wayth, R. B.; Wen, L.

doi:10.1071/as09082

Cited by 117 publications

(64 citation statements)

References 30 publications

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“…The observations were carried out using the commissioning array under the Commensal Real-Time ASKAP Fast-Transients (CRAFT) survey (Macquart et al 2010). Depending on availability we used 6-8 ASKAP antennas in the incoherent summed mode.…”

Section: Observationsmentioning

confidence: 99%

A fast radio burst in the direction of the Virgo Cluster

Agarwal

Lorimer

Fialkov

et al. 2019

Monthly Notices of the Royal Astronomical Society

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The rate of fast radio bursts (FRBs) in the direction of nearby galaxy clusters is expected to be higher than the mean cosmological rate if intrinsically faint FRBs are numerous. In this paper, we describe a targeted search for faint FRBs near the core of the Virgo cluster using the Australian Square Kilometer Array Pathfinder telescope. During 300 hr of observations, we discovered one burst, FRB 180417, with dispersion measure DM = 474.8 cm −3 pc. The FRB was promptly followed up by several radio telescopes for 27 h, but no repeat bursts were detected. An optical followup of FRB 180417 using the PROMPT5 telescope revealed no new sources down to an R-band magnitude of 20.1. We argue that FRB 180417 is likely behind the Virgo cluster as the Galactic and intracluster DM contribution are small compared to the DM of the FRB, and there are no galaxies in the line of sight. The non-detection of FRBs from Virgo constrains the faint-end slope, α < 1.52 (at 68% confidence limit), and the minimum luminosity, L min 2 × 10 40 erg s −1 (at 68% confidence limit), of the FRB luminosity function assuming cosmic FRB rate of 10 4 FRBs sky −1 day −1 with flux above 1 Jy located out to redshift of 1. Further FRB surveys of galaxy clusters with high-sensitivity instruments will tighten the constraints on the faint end of the luminosity function and, thus, are strongly encouraged.

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Section: Observationsmentioning

confidence: 99%

A fast radio burst in the direction of the Virgo Cluster

Agarwal

Lorimer

Fialkov

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…In this paper, we present a high time resolution analysis of FRB 181112 discovered as part of the Commensal Real-time ASKAP Fast Transients (CRAFT) survey (Macquart et al 2010). This burst was initially detected with a signal-to-noise ratio (S/N) of 19.3 in the CRAFT incoherent detection pipeline, in observations centred at 1297.5 MHz, with a measured duration of 2.1(2) ms and a fluence 26(3) Jy ms, as reported by Prochaska et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism

Cho

Macquart

Shannon

et al. 2020

ApJL

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We have developed a new coherent dedispersion mode to study the emission of Fast Radio Bursts that trigger the voltage capture capability of the Australian SKA Pathfinder (ASKAP) interferometer. In principle the mode can probe emission timescales down to 3 ns with full polarimetric information preserved. Enabled by the new capability, here we present a spectropolarimetric analysis of FRB 181112 detected by ASKAP, localized to a galaxy at redshift 0.47. At microsecond time resolution the burst is resolved into four narrow pulses with a rise time of just 15 µs for the brightest. The pulses have a diversity of morphology, but do not show evidence for temporal broadening by turbulent plasma along the line of sight, nor is there any evidence for periodicity in their arrival times. The pulses are highly polarized (up to 95%), with the polarization position angle varying both between and within pulses. The pulses have apparent rotation measures that vary by 15 ± 2 rad m −2 and apparent dispersion measures that vary by 0.041 ± 0.004 pc cm −3 . Conversion between linear and circular polarization is observed across the brightest pulse. We conclude that the FRB 181112 pulses are most consistent with being a direct manifestation of the emission process or the result of propagation through a relativistic plasma close to the source. This demonstrates that our method, which facilitates high-time-resolution polarimetric observations of FRBs, can be used to study not only burst emission processes, but also a diversity of propagation effects present on the gigaparsec paths they traverse.

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“…This advance is enabled by the phased array feeds mounted on each of its 12-m antennas, yielding a 30 deg 2 field of view. The aim of the Commensal Real-time ASKAP Fast Transients (CRAFT; Macquart et al 2010) survey is to equip ASKAP with high time-resolution capabilities that access its entire field of view on timescales of 1 ms.…”

Section: Introductionmentioning

confidence: 99%

The Detection of an Extremely Bright Fast Radio Burst in a Phased Array Feed Survey

Bannister

Shannon

Macquart

et al. 2017

ApJL

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170

129

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We report the detection of an ultra-bright fast radio burst (FRB) from a modest, 3.4-day pilot survey with the Australian Square Kilometre Array Pathfinder. The survey was conducted in a wide-field fly's-eye configuration using the phased-array-feed technology deployed on the array to instantaneously observe an effective area of 160 deg 2 , and achieve an exposure totaling 13200 deg 2 hr . We constrain the position of FRB170107 to a region ¢´¢ 8 8 in size (90% containment) and its fluence to be 58±6 Jy ms. The spectrum of the burst shows a sharp cutoff above 1400 MHz, which could be due to either scintillation or an intrinsic feature of the burst. This confirms the existence of an ultra-bright (>20 Jy ms) population of FRBs.

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The Commensal Real-Time ASKAP Fast-Transients (CRAFT) Survey

Cited by 117 publications

References 30 publications

A fast radio burst in the direction of the Virgo Cluster

A fast radio burst in the direction of the Virgo Cluster

Spectropolarimetric Analysis of FRB 181112 at Microsecond Resolution: Implications for Fast Radio Burst Emission Mechanism

The Detection of an Extremely Bright Fast Radio Burst in a Phased Array Feed Survey

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