%0 Journal Article
%A Ruiter, Iris de
%A Meyers, Zachary Samuel
%A Rowlinson, Antonia
%A Shimwell, Timothy W.
%A Wijers, Ralph A. M. J.
%T Transient study using LoTSS - framework development and preliminaryresults
%J Monthly notices of the Royal Astronomical Society
%V 531
%N 4
%@ 0035-8711
%C Oxford
%I Oxford Univ. Press
%M PUBDB-2023-01522
%P 4805-4822
%D 2024
%X We present a search for transient radio sources on time-scales of seconds to hours at 144 MHz using the LOFAR Two-metre Sky Survey (LoTSS). This search is conducted by examining short time-scale images derived from the LoTSS data. To allow imaging of LoTSS on short time-scales, a modern imaging procedure and fast filtering strategy are introduced. This includes sky model source subtraction, no cleaning or primary beam correction, a simple source finder, fast filtering schemes, and source catalogue matching. This new strategy is first tested by injecting simulated transients, with a range of flux densities and durations, into the data. We find the limiting sensitivity to be 113 and 6 mJy for 8 s and 1 h transients, respectively. The new imaging and filtering strategies are applied to 58 fields of the LoTSS survey, corresponding to LoTSS-DR1 (2 per cent of the survey). One transient source is identified in the 8 s and 2 min snapshot images. The source shows 1 min duration flare in the 8 h observation. Our method puts the most sensitive constraints on/estimates of the transient surface density at low frequencies at time-scales of seconds to hours; <4.0 × 10<sup>−4</sup> deg<sup>−2</sup> at 1 h at a sensitivity of 6.3 mJy; 5.7 × 10<sup>−7</sup> deg<sup>−2</sup> at 2 min at a sensitivity of 30 mJy; and 3.6 × 10<sup>−8</sup> deg<sup>−2</sup> at 8 s at a sensitivity of 113 mJy. In the future, we plan to apply the strategies presented in this paper to all LoTSS data. 
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001253064300001
%R 10.1093/mnras/stae1458
%U https://bib-pubdb1.desy.de/record/581023