LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole
Monthly Notices of the Royal Astronomical Society Oxford University Press 456:3 (2016) 2321-2342
Authors:
AJ Stewart, Robert Fender, JW Broderick, TE Hassall, T Muñoz-Darias, A Rowlinson, JD Swinbank, TD Staley, GJ Molenaar, B Scheers, TL Grobler, M Pietka, G Heald, JP McKean, ME Bell, A Bonafede, RP Breton, D Carbone, Y Cendes, AO Clarke, S Corbel, F de Gasperin, J Eislöffel, H Falcke, C Ferrari, J-M Grießmeier, MJ Hardcastle, V Heesen, JWT Hessels, A Horneffer, M Iacobelli, P Jonker, Aris Karastergiou, G Kokotanekov, VI Kondratiev, M Kuniyoshi, CJ Law, J van Leeuwen, S Markoff, JCA Miller-Jones, D Mulcahy, E Orru, M Pandey-Pommier, L Pratley, E Rol, HJA Röttgering, AMM Scaife, A Shulevski, CA Sobey, BW StappersAbstract:
We present the results of a four-month campaign searching for low-frequency radio transients near the North Celestial Pole with the Low-Frequency Array (LOFAR), as part of the Multifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April and comprised 2149 11-min snapshots, each covering 175 deg 2 . We have found one convincing candidate astrophysical transient, with a duration of a few minutes and a flux density at 60 MHz of 15-25 Jy. The transient does not repeat and has no obvious optical or high-energy counterpart, as a result of which its nature is unclear. The detection of this event implies a transient rate at 60 MHz of 3.9 -3.7 +14.7 × 10 -4 d -1 deg -2 , and a transient surface density of 1.5 × 10 -5 deg -2 , at a 7.9-Jy limiting flux density and ~10-min time-scale. The campaign data were also searched for transients at a range of other time-scales, from 0.5 to 297 min, which allowed us to place a range of limits on transient rates at 60MHz as a function of observation duration.Localization and broadband follow-up of the gravitational-wave transient GW150914
(2016)
Authors:
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