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LIGO_casebook

ZURAB K. SILAGADZE

ZURAB K. SILAGADZE Alleged correlated noise in LIGO data and the Schumann resonance transients Z.K. Silagadze (Submitted on 27 Jul 2017) Recently it was claimed that the LIGO residual noise at the time of the GW150914 gravitational-wave detection event contains some unexplained correlated noise. At that the noise correlations are maximized at the same time-delay as the signal correlations in two LIGO detectors. We argue that the Schumann resonance transients excited by strong lightnings and Q-bursts in Africa will have just this time lag of about 7~ms. Therefore if the correlated noise related to the Schumann resonance transients is indeed present in the LIGO data, its "African part" will show just the proper time-delay and its coincidence with the gravitational-wave time delay is only a coincidence. Comments: Subjects: Cite as: 10 pages, one table Instrumentation and Methods for Astrophysics (astro-ph.IM); General Relativity and Quantum Cosmology (gr-qc) arXiv:1707.09047 [astro-ph.IM] (or arXiv:1707.09047v1 [astro-ph.IM] for this version) 126

Izabela Kowalska-Leszczynska1 et al Globally coherent short duration magnetic field transients and their effect on ground based gravitational-wave detectors Izabela Kowalska-Leszczynska1 , Marie-Anne Bizouard2 , Tomasz Bulik1 , Nelson Christensen3,4 , Michael Coughlin5 , Mark Go lkowski6 , Jerzy Kubisz7 , Andrzej Kulak8 , Janusz Mlynarczyk8 , Florent Robinet2 , Max Rohde3 1Astronomical Observatory Warsaw University, 00-478 Warsaw, Poland 2LAL, Universit´e Paris- Sud, CNRS/IN2P3, Universit´e Paris-Saclay, 91400 Orsay, France 3Physics and Astronomy, Carleton College, Northfield, MN 55057, USA 4Universit´e Cˆote d’Azur, Observatoire Cˆote d’Azur, CNRS, ARTEMIS UMR 7250, 06304 Nice, France 5Department of Physics, Harvard University, Cambridge, MA 02138, USA 6Department of Electrical Engineering, University of Colorado Denver, Denver, CO 80204, USA 7Astronomical Observatory, Jagiellonian University, Krakow, Poland 8AGH University of Science and Technology, Department of Electronics, Krakow, Poland Abstract. It has been recognized that the magnetic fields from the Schumann resonances could affect the search for a stochastic gravitational-wave background by LIGO and Virgo. Presented here are the observations of short duration magnetic field transients that are coincident in the magnetometers at the LIGO and Virgo sites. Data from low-noise magnetometers in Poland and Colorado, USA, are also used and show short duration magnetic transients of global extent. We measure at least 2.3 coincident (between Poland and Colorado) magnetic transient events per day where one of the pulses exceeds 200 pT. Given the recently measured values of the magnetic coupling to differential arm motion for Advanced LIGO, there would be a few events per day that would appear simultaneously at the gravitational-wave detector sites and could move the test masses of order 10−18 m. We confirm that in the advanced detector era short duration transient gravitational-wave searches must account for correlated magnetic field noise in the global detector network. 127

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