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23rd of August 2018
An ASKAP pilot survey for variable and transient sources
by Shivani Bhandari
Bhandari et al. have conduced a pilot survey for variable and transient sources at 1.4 GHz on the timescale of days with the Australian Square Kilometre Array Pathfinder (ASKAP). The search yielded nine potential variable sources which are identified to be compact active galactic nucleus undergoing refractive interstellar scintillation. We also detect a highly variable source with flux density variations greater than 50% over a time interval of a decade between the Sydney University Molonglo Sky Survey (SUMSS) and our latest ASKAP observations. We find this source to be consistent with the properties of long-term variability of a quasar. No transients were detected on time-scales of days and we place an upper limit in the above plot (blue point). The future VAST-Wide survey with 36-ASKAP dishes will probe the transient phase space with similar cadence to our pilot survey, but better sensitivity, and will detect and monitor rarer brighter events.

More details are given in the full paper , which is published in Monthly Notices of the Royal Astronomical Society.

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