Five new real-time detections of Fast Radio Bursts with UTMOST. (arXiv:1905.02293v1 [astro-ph.HE])

Five new real-time detections of Fast Radio Bursts with UTMOST. (arXiv:1905.02293v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Farah_W/0/1/0/all/0/1">W. Farah</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Flynn_C/0/1/0/all/0/1">C. Flynn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bailes_M/0/1/0/all/0/1">M. Bailes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jameson_A/0/1/0/all/0/1">A. Jameson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bateman_T/0/1/0/all/0/1">T. Bateman</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Campbell_Wilson_D/0/1/0/all/0/1">D. Campbell-Wilson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Day_C/0/1/0/all/0/1">C. K. Day</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Deller_A/0/1/0/all/0/1">A. T. Deller</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Green_A/0/1/0/all/0/1">A. J. Green</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gupta_V/0/1/0/all/0/1">V. Gupta</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hunstead_R/0/1/0/all/0/1">R. Hunstead</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lower_M/0/1/0/all/0/1">M. E. Lower</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oslowski_S/0/1/0/all/0/1">S. Osłowski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Parthasarathy_A/0/1/0/all/0/1">A. Parthasarathy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Price_D/0/1/0/all/0/1">D. C. Price</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ravi_V/0/1/0/all/0/1">V. Ravi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Shannon_R/0/1/0/all/0/1">R. M. Shannon</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sutherland_A/0/1/0/all/0/1">A. Sutherland</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Temby_D/0/1/0/all/0/1">D. Temby</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Krishnan_V/0/1/0/all/0/1">V. Venkatraman Krishnan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Caleb_M/0/1/0/all/0/1">M. Caleb</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chang_S/0/1/0/all/0/1">S.-W. Chang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cruces_M/0/1/0/all/0/1">M. Cruces</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Roy_J/0/1/0/all/0/1">J. Roy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morello_V/0/1/0/all/0/1">V. Morello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Onken_C/0/1/0/all/0/1">C. A. Onken</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stappers_B/0/1/0/all/0/1">B. W. Stappers</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wolf_C/0/1/0/all/0/1">C. Wolf</a>

We detail a new fast radio burst (FRB) survey with the Molonglo Radio
Telescope, in which six FRBs were detected between June 2017 and December 2018.
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 timescales ranging from 0.16 to 29.1 ms. One burst, FRB181017, shows
remarkable temporal structure, with 3 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$^{-1}$ day$^{-1}$ 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
$alpha=-1.6$ ($F_{nu}proptonu^{alpha}$). Our results suggest that FRB
spectra may turn over below 1 GHz. Optical, radio and X-ray followup 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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