Null-stream veto for two co-located detectors: Implementation issues

Abstract

Time-series data from multiple gravitational wave (GW) detectors can be linearly combined to form a null-stream, in which all GW information will be cancelled out. This null-stream can be used to distinguish between actual GW triggers and spurious noise transients in a search for GW bursts using a network of detectors. The biggest source of error in the null-stream analysis comes from the fact that the detector data are not perfectly calibrated. In this paper, we present an implementation of the null-stream veto in the simplest network of two co-located detectors. The detectors are assumed to have calibration uncertainties and correlated noise components. We estimate the effect of calibration uncertainties in the null-stream veto analysis and propose a new formulation to overcome this. This new formulation is demonstrated by doing software injections in Gaussian noise.

Minor changes; To appear in Class. Quantum Grav. (Proc. GWDAW10)

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Cited by in corpus (10)

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• Generic searches for alternative gravitational wave polarizations with networks of interferometric detectors
• Mock data study for next-generation ground-based detectors: The performance loss of matched filtering due to correlated confusion noise
• Utilizing the null stream of the Einstein Telescope
• Null stream analysis of Pulsar Timing Array data: localisation of resolvable gravitational wave sources
• Physical instrumental vetoes for gravitational-wave burst triggers
• Null-stream-based Bayesian Unmodeled Framework to Probe Generic Gravitational-wave Polarizations