The performance and calibration of the CRAFT fly's eye fast radio burst survey

被引：20

作者：

James, C. W. ^{[1
,2
]}

Bannister, K. W. ^{[3
]}

Macquart, J-P ^{[1
,2
]}

Ekers, R. D. ^{[1
,3
]}

Oslowski, S. ^{[4
]}

Shannon, R. M. ^{[1
,2
,4
]}

Allison, J. R. ^{[5
]}

Chippendale, A. P. ^{[3
]}

Collier, J. D. ^{[3
,6
]}

Franzen, T. ^{[7
]}

Hotan, A. W. ^{[7
]}

Leach, M. ^{[3
]}

McConnell, D. ^{[3
]}

Pilawa, M. A. ^{[3
]}

Voronkov, M. A. ^{[3
]}

Whiting, M. T. ^{[3
]}

机构：

[1] Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia

[2] Australian Res Council, Ctr Excellence All Sky Astrophys CAASTRO, Canberra, ACT, Australia

[3] CSIRO, Astron & Space Sci, Austral Telescope Natl Facil, POB 76, Epping, NSW 1710, Australia

[4] Swinburne Univ Technol, POB 218, Hawthorn, Vic 3122, Australia

[5] Univ Oxford, Sub Dept Astrophys, Dept Phys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England

[6] Western Sydney Univ, Sch Comp Engn & Math, Locked Bag 1797, Penrith, NSW 2751, Australia

[7] CSIRO, Astron & Space Sci, Australia Telescope Natl Facil, POB 1130, Bentley, WA 6102, Australia

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA | 2019年 / 36卷

基金：

澳大利亚研究理事会;

关键词：

methods: data analysis; telescopes; surveys; INTRINSIC VARIABILITY; PULSAR; STATISTICS; SEARCH; FIELD;

D O I：

10.1017/pasa.2019.1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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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