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Five new real-time detections of Fast Radio Bursts with UTMOST

Farah, W. and Flynn, C. and Bailes, M. and Jameson, A. and Bateman, T. and Campbell-Wilson, D. and Day, C. K. and Deller, A. T. and Green, A. J. and Gupta, V. and Hunstead, R. and Lower, M. E. and Osłowski, S. and Parthasarathy, A. and Price, D. C. and Ravi, V. and Shannon, R. M. and Sutherland, A. and Temby, D. and Venkatraman Krishnan, V. and Caleb, M. and Chang, S.-W. and Cruces, M. and Roy, J. and Morello, V. and Onken, C. A. and Stappers, B. W. and Wolf, C. (2019) Five new real-time detections of Fast Radio Bursts with UTMOST. Monthly Notices of the Royal Astronomical Society, 488 (3). pp. 2989-3002. ISSN 0035-8711. doi:10.1093/mnras/stz1748.

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We detail a new fast radio burst (FRB) survey with the Molonglo Radio Telescope, in which six FRBs were detected between 2017 June and 2018 December. By using a real-time FRB detection system, we captured raw voltages for five of the six events, which allowed for coherent dedispersion and very high time resolution (10.24 μs) studies of the bursts. Five of the FRBs show temporal broadening consistent with interstellar and/or intergalactic scattering, with scattering time-scales ranging from 0.16 to 29.1 ms. One burst, FRB181017, shows remarkable temporal structure, with three peaks each separated by 1 ms. We searched for phase-coherence between the leading and trailing peaks and found none, ruling out lensing scenarios. Based on this survey, we calculate an all-sky rate at 843 MHz of 98^(+59)_(−39) events sky^(−1) d^(−1) to a fluence limit of 8 Jy ms: a factor of 7 below the rates estimated from the Parkes and ASKAP telescopes at 1.4 GHz assuming the ASKAP-derived spectral index α = −1.6 (F_ν ∝ ν^α). Our results suggest that FRB spectra may turn over below 1 GHz. Optical, radio, and X-ray follow-up has been made for most of the reported bursts, with no associated transients found. No repeat bursts were found in the survey.

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Farah, W.0000-0002-0161-7243
Ravi, V.0000-0002-7252-5485
Venkatraman Krishnan, V.0000-0001-9518-9819
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 June 17. Received 2019 June 16; in original form 2019 May 3. Published: 04 July 2019. We thank Michael Kramer for valuable discussions on FRB scattering tail fitting. We thank Laura Spitler for assistance with the Effelsberg data analysis. The anonymous referee is thanked for comments which clarified our thinking on a number of points. The Molonglo Observatory is owned and operated by the University of Sydney, with support from the School of Physics and the University. The UTMOST project is also supported by the Swinburne University of Technology. We acknowledge the Australian Research Council grants CE110001020 (CAASTRO) and the Laureate Fellowship FL150100148. ATD is supported by an ARC Future Fellowship grant FT150100415. MC and BWS acknowledge funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 694745). The national facility capability for SkyMapper has been funded through the Australian Research Council LIEF grant LE130100104, awarded to the University of Sydney, the Australian National University, Swinburne University of Technology, the University of Queensland, the University of Western Australia, the University of Melbourne, Curtin University of Technology, Monash University, and the Australian Astronomical Observatory. SkyMapper is owned and operated by The Australian National University’s Research School of Astronomy and Astrophysics. The GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research, India. We acknowledge support of GMRT telescope operators for the observations. This research has made use of NASA’s Astrophysics Data System.
Funding AgencyGrant Number
University of SydneyUNSPECIFIED
Swinburne University of TechnologyUNSPECIFIED
Australian Research CouncilCE110001020
Australian Research CouncilFL150100148
Australian Research CouncilFT150100415
European Research Council (ERC)694745
Australian Research CouncilLE130100104
Subject Keywords:instrumentation: interferometers – methods: data analysis
Issue or Number:3
Record Number:CaltechAUTHORS:20190624-152334440
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Official Citation:W Farah, C Flynn, M Bailes, A Jameson, T Bateman, D Campbell-Wilson, C K Day, A T Deller, A J Green, V Gupta, R Hunstead, M E Lower, S Osłowski, A Parthasarathy, D C Price, V Ravi, R M Shannon, A Sutherland, D Temby, V Venkatraman Krishnan, M Caleb, S-W Chang, M Cruces, J Roy, V Morello, C A Onken, B W Stappers, S Webb, C Wolf, Five new real-time detections of fast radio bursts with UTMOST, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 3, September 2019, Pages 2989–3002,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96676
Deposited By: Tony Diaz
Deposited On:25 Jun 2019 18:13
Last Modified:16 Nov 2021 17:23

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