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005     20250715170946.0
024 7 _ |a 10.1093/mnras/stae1458
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100 1 _ |a Ruiter, Iris de
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245 _ _ |a Transient study using LoTSS - framework development and preliminaryresults
260 _ _ |a Oxford
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520 _ _ |a 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$^{−4}$ deg$^{−2}$ at 1 h at a sensitivity of 6.3 mJy; 5.7 × 10$^{−7}$ deg$^{−2}$ at 2 min at a sensitivity of 30 mJy; and 3.6 × 10$^{−8}$ deg$^{−2}$ 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.
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700 1 _ |a Meyers, Zachary Samuel
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700 1 _ |a Shimwell, Timothy W.
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773 _ _ |a 10.1093/mnras/stae1458
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