Five new real-time detections of fast radio bursts with UTMOST-Reference-Cited by-同舟云学术

Five new real-time detections of fast radio bursts with UTMOST

Published:2019-07-04 Issue:3 Volume:488 Page:2989-3002
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Farah W¹^ORCID,Flynn C¹²,Bailes M¹³,Jameson A¹²,Bateman T⁴,Campbell-Wilson D⁴,Day C K¹,Deller A T¹²^ORCID,Green A J⁴,Gupta V¹,Hunstead R⁴,Lower M E¹⁵^ORCID,Osłowski S¹^ORCID,Parthasarathy A¹^ORCID,Price D C¹⁶,Ravi V⁷⁸,Shannon R M¹³,Sutherland A⁴,Temby D⁴,Krishnan V Venkatraman¹²⁹^ORCID,Caleb M¹⁰¹¹,Chang S-W²³¹¹,Cruces M⁹,Roy J¹²,Morello V¹⁰^ORCID,Onken C A²³¹¹,Stappers B W¹⁰,Webb S¹³,Wolf C²¹¹^ORCID

Affiliation:

1. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Mail H30, PO Box 218, Melbourne, VIC 3122, Australia

2. ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Building A28, School of Physics, The University of Sydney, Sydney, NSW 2006, Australia

3. ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav), Swinburne University of Technology, Mail number H74, PO Box 218, Melbourne, VIC 3122, Australia

4. Sydney Institute for Astronomy, School of Physics A28, University of Sydney, Sydney, NSW 2006, Australia

5. CSIRO Astronomy and Space Science, Australia Telescope National Facility, Epping, NSW 1710, Australia

6. Department of Astronomy, University of California Berkeley, 501 Campbell Hall, Berkeley, CA 94720, USA

7. Center for Astrophysics | Harvard, Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA

8. Cahill Centre for Astronomy and Astrophysics, MC 249-17, California Institute of Technology, Pasadena, CA 91125, USA

9. Max-Plank-Institute für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

10. Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK

11. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia

12. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411 007, India

Abstract

Abstract 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 $\mu$s) 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 (Fν ∝ να). 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.

Funder

University of Sydney

Swinburne University of Technology

Australian Research Council

European Research Council

Horizon 2020

Australian National University

University of Queensland

University of Western Australia

University of Melbourne

Curtin University of Technology

Monash University