تقرير
Five new real-time detections of Fast Radio Bursts with UTMOST
| العنوان: | Five new real-time detections of Fast Radio Bursts with UTMOST |
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| المؤلفون: | 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., Wolf, C. |
| سنة النشر: | 2019 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - High Energy Astrophysical Phenomena |
| الوصف: | 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 $\alpha=-1.6$ ($F_{\nu}\propto\nu^{\alpha}$). 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. Comment: 13 pages, 11 figures, submitted to MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stz1748 |
| URL الوصول: | http://arxiv.org/abs/1905.02293 |
| رقم الأكسشن: | edsarx.1905.02293 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stz1748 |
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