期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
卷 36, 期 -, 页码 -出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/pasa.2019.1
关键词
methods: data analysis; telescopes; surveys
资金
- Australian Research Council [FL150100148, DP18010085]
- Australian Research Council Centre of Excellence for All Sky Astrophysics (CAASTRO) [CE110001020]
- Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO3D) [CE170100013]
- Australian Government
- National Collaborative Research Infrastructure Strategy
- Government of Western Australia
- Science and Industry Endowment Fund
- [CE170100004]
- Australian Research Council [CE170100004] Funding Source: Australian Research Council
The Commensal Real-time Australian Square Kilometre Array Pathfinder Fast Transients survey is the first extensive astronomical survey using phased array feeds. Since January 2017, it has been searching for fast radio bursts in fly's eye mode. Here, we present a calculation of the sensitivity and total exposure of the survey that detected the first 20 of these bursts, using the pulsars B1641-45 and B0833-45 as calibrators. The beamshape, antenna-dependent system noise, and the effects of radio-frequency interference and fluctuations during commissioning are quantified. Effective survey exposures and sensitivities are calculated as a function of the source counts distribution. Statistical 'stat' and systematics 'sys' effects are treated separately. The implied fast radio burst rate is significantly lower than the 37 sky(-1) day(-1) calculated using nominal exposures and sensitivities for this same sample by Shannon et al. (2018). At the Euclidean (best-fit) power-law index of -1.5 (-2.2), the rate is $12.7_{-2.2}<^>{+3.3}$ (sys) +/- 3.6 (stat) sky(-1) day(-1) ($20.7_{-1.7}<^>{+2.1}$ (sys) +/- 2.8 (stat) sky(-1) day(-1)) above a threshold of 56.6 +/- 6.6(sys) Jy ms (40.4 +/- 1.2(sys) Jy ms). This strongly suggests that these calculations be performed for other FRB-hunting experiments, allowing meaningful comparisons to be made between them.
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