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Near optimal solution to the inverse problem for gravitational-wave bursts

Gürsel, Yekta and Tinto, Massimo (1989) Near optimal solution to the inverse problem for gravitational-wave bursts. Physical Review D, 40 (12). pp. 3884-3938. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:GURprd89

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Abstract

We develop a method for determining the source direction (θ,φ) and the two waveforms h+(t), h×(t) of a gravitational-wave burst using noisy data from three wideband gravitational-wave detectors running in coincidence. The scheme does not rely on any assumptions about the waveforms and in fact it works for gravitational-wave bursts of any kind. To improve the accuracy of the solution for (θ,φ), h+(t), h×(t), we construct a near optimal filter for the noisy data which is deduced from the data themselves. We implement the method numerically using simulated data for detectors that operate, with white Gaussian noise, in the frequency band of 500–2500 Hz. We show that for broadband signals centered around 1 kHz with a conventional signal-to-noise ratio of at least 10 in each detector we are able to locate the source within a solid angle of 1×10^-5 sr. If the signals and the detectors’ band were scaled downwards in frequency by a factor ι, at fixed signal-to-noise ratio, then the solid angle of the source’s error box would increase by a factor ι^2. The simulated data are assumed to be produced by three detectors: one on the east coast of the United States of America, one on the west coast of the United States of America, and the third in Germany or Western Australia. For conventional signal-to-noise ratios significantly lower than 10 the method still converges to the correct combination of the relative time delays but it is unable to distinguish between the two mirror-image directions defined by the relative time delays. The angular spread around these points increases as the signal-to-noise ratio decreases. For conventional signal-to-noise ratios near 1 the method loses its resolution completely.


Item Type:Article
Additional Information:©1989 The American Physical Society Received 24 July 1989 We thank Kip S. Thorne for reading an earlier version of this paper, for maiing many useful comments and for suggesting the method should be optimized. We thank R.W.P. Drever, Frank B. Estabrook, and Bernard F. Schutz for stimulating discussions. We also thank the members of the Theoretical Astrophysics and the Gravitational Physics groups of California Institute of Technology for their hospitality. M.T. acknowledges the support provided by the National Science Foundation under Grants Nos. AST85-14911 and AST88-17792. Y.G. is supported by the National Science Foundation under Grant No. PHY88-03557. We used part of the Caltech block grant from the San Diego Supercomputer Center while performing the simulations on the Cray X-MP/48 and we thank Aron Kuppermann for granting supercomputing time at the San Diego Supercomputer Center and for extending the grant subsequently. The plots in this paper were generated using the NCAR graphics library. The text editor GNUEmacs was used in developing the program, in analyzing the results and in writing this paper. We also thank the Theoretical Asotrophysics Group at Caltech and the LIGO project for providing some of the computing resources.
Record Number:CaltechAUTHORS:GURprd89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:GURprd89
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.40.3884
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6602
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:14 Dec 2006
Last Modified:26 Dec 2012 09:23

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