Details

Autor(en) / Beteiligte

• Farah, W
• Flynn, C
• Bailes, M
• Jameson, A
• Bateman, T
• Campbell-Wilson, D
• Day, C K
• Deller, A T
• Green, A J
• Gupta, V
• Hunstead, R
• Lower, M E
• Osłowski, S
• Parthasarathy, A
• Price, D C
• Ravi, V
• Shannon, R M
• Sutherland, A
• Temby, D
• Krishnan, V Venkatraman
• Caleb, M
• Chang, S-W
• Cruces, M
• Roy, J
• Morello, V
• Onken, C A
• Stappers, B W
• Webb, S
• Wolf, C

Titel

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

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2019-09, Vol.488 (3), p.2989-3002

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2019

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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.