The SUrvey for Pulsars and Extragalactic Radio Bursts II: New FRB discoveries and their follow-up Bhandari, S. Díaz García, Antonio Francisco Navas Concha, Sergio Antares Collaboration Surveys Radiation mechanisms: general Intergalactic medium Radio continuum: general Methods: observational Methods: data analysis SB would like to thank Tara Murphy, Martin Bell, Paul Hancock, Keith Bannister, Chris Blake and Bing Zhang for useful discussions. We report the discovery of four Fast Radio Bursts (FRBs) in the ongoing SUrvey for Pulsars and Extragalactic Radio Bursts at the Parkes Radio Telescope: FRBs 150610, 151206, 151230 and 160102. Our real-time discoveries have enabled us to conduct extensive, rapid multimessenger follow-up at 12 major facilities sensitive to radio, optical, X-ray, gamma-ray photons and neutrinos on time-scales ranging from an hour to a few months post-burst. No counterparts to the FRBs were found and we provide upper limits on afterglow luminosities. None of the FRBs were seen to repeat. Formal fits to all FRBs show hints of scattering while their intrinsic widths are unresolved in time. FRB 151206 is at low Galactic latitude, FRB 151230 shows a sharp spectral cut-off, and FRB 160102 has the highest dispersion measure (DM = 2596.1 ± 0.3 pc cm−3) detected to date. Three of the FRBs have high dispersion measures (DM > 1500 pc cm−3), favouring a scenario where the DM is dominated by contributions from the intergalactic medium. The slope of the Parkes FRB source counts distribution with fluences >2 Jy ms is α=−2.2+0.6−1.2 and still consistent with a Euclidean distribution (α = −3/2). We also find that the all-sky rate is 1.7+1.5−0.9×103 FRBs/(4π sr)/day above ∼2Jyms and there is currently no strong evidence for a latitude-dependent FRB sky rate. 2018-05-24T07:28:26Z 2018-05-24T07:28:26Z 2017-11-23 journal article Bhandari, S; et. al. The SUrvey for Pulsars and Extragalactic Radio Bursts II: New FRB discoveries and their follow-up. MNRAS 475, 1427–1446 (2018) [Preprint 23 November 2017] [http://hdl.handle.net/10481/51131] http://hdl.handle.net/10481/51131 doi.org/10.1093/mnras/stx3074 eng info:eu-repo/grantAgreement/EC/FP7/ERC Grant Agreement n. 617199 (EP) http://creativecommons.org/licenses/by-nc-nd/3.0/es/ open access Atribución-NoComercial-SinDerivadas 3.0 España Oxford University Press