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Fast Radio Transient searches with UTMOST at 843 MHz

Caleb, M. and Flynn, C. and Bailes, M. and Barr, E. D. and Bateman, T. and Bhandari, S. and Campbell-Wilson, D. and Green, A. J. and Hunstead, R. W. and Jameson, A. and Jankowski, F. and Keane, E. F. and Ravi, V. and van Straten, W. and Venkataraman Krishnan, V. (2016) Fast Radio Transient searches with UTMOST at 843 MHz. Monthly Notices of the Royal Astronomical Society, 458 (1). pp. 718-725. ISSN 0035-8711. doi:10.1093/mnras/stw109.

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We report the first radio interferometric search at 843 MHz for fast transients, particularly Fast Radio Bursts (FRBs). The recently recommissioned Swinburne University of Technology's digital backend for the Molonglo Observatory Synthesis Telescope array (the UTMOST) with its large collecting area (18 000 m^2) and wide instantaneous field of view (7.80 deg^2) is expected to be an efficient tool to detect FRBs. As an interferometer it will be capable of discerning whether the FRBs are truly a celestial population. We show that UTMOST at full design sensitivity can detect an event approximately every few days. We report on two preliminary FRB surveys at about 7 per cent and 14 per cent, respectively, of the array's final sensitivity. Several pulsars have been detected via single pulses and no FRBs were discovered with pulse widths (W), in the range 655.36 μs < W < 41.9 ms and dispersion measures (DMs) in the range 100 < DM < 2000 pc cm^(−3). This non-detection sets a 2σ upper limit of the sky rate of not more than 1000 events sky^(−1) d^(−1 at 843 MHz down to a flux limit of 11 Jy for 1 ms FRBs. We show that this limit is consistent with previous survey limits at 1.4 GHz and 145 MHz and set a lower limit on the mean spectral index of FRBs of α > −3.2.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Caleb, M.0000-0002-4079-4648
Bailes, M.0000-0003-3294-3081
Hunstead, R. W.0000-0002-3205-8288
Jankowski, F.0000-0002-6658-2811
Keane, E. F.0000-0002-4553-655X
Ravi, V.0000-0002-7252-5485
Additional Information:© 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 January 11. Received 2016 January 11; in original form 2015 November 26. The authors would like to thank the staff at the Molonglo Observatory for the exceptional support provided. The Molonglo Observatory is owned and operated by the University of Sydney with support from the Australian Research Council (ARC) and the Science Foundation within the School of Physics. The upgrade to the telescope has been supported by the University of Sydney, Swinburne University of Technology and the ARC, including via CAASTRO. Parts of this research were conducted by the Australian Research Council Centre for All-Sky Astrophysics (CAASTRO), through project number CE110001020.
Funding AgencyGrant Number
Australian Research CouncilCE110001020
University of SydneyUNSPECIFIED
Subject Keywords:instrumentation: interferometers, methods: data analysis, surveys, pulsars: general
Issue or Number:1
Record Number:CaltechAUTHORS:20190626-114048785
Persistent URL:
Official Citation:M. Caleb, C. Flynn, M. Bailes, E. D. Barr, T. Bateman, S. Bhandari, D. Campbell-Wilson, A. J. Green, R. W. Hunstead, A. Jameson, F. Jankowski, E. F. Keane, V. Ravi, W. van Straten, V. Venkataraman Krishnan, Fast Radio Transient searches with UTMOST at 843 MHz, Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 1, 01 May 2016, Pages 718–725,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96736
Deposited By: George Porter
Deposited On:26 Jun 2019 19:53
Last Modified:16 Nov 2021 17:23

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