CERN Accelerating science

Article
Report number	arXiv:1002.3515
Title	IGEC2: A 17-month search for gravitational wave bursts in 2005-2007
Author(s)	Astone, P. (INFN, Rome) ; Baggio, L. (LATMOS, Guyancourt) ; Bassan, M. (Rome U. ; INFN, Rome) ; Bignotto, M. (Padua U. ; INFN, Padua) ; Bonaldi, M. (IFN, Rome ; INFN, Padua) ; Bonifazi, P. (INFN, Rome ; INAF, Rome) ; Cavallari, G. (CERN) ; Cerdonio, M. (Padua U. ; INFN, Padua) ; Coccia, E. (Rome U. ; INFN, Rome) ; Conti, L. (INFN, Padua) ; D'Antonio, S. (INFN, Rome) ; di Paolo Emilio, M. (Gran Sasso) ; Drago, M. (Padua U. ; INFN, Padua) ; Fafone, V. (Rome U. ; INFN, Rome) ; Falferi, P. (IFN, Rome ; INFN, Padua) ; Foffa, S. (Geneva U.) ; Fortini, P. (Ferrara U. ; INFN, Ferrara) ; Frasca, S. (INFN, Rome ; Rome U.) ; Giordano, G. (Frascati) ; Hamilton, W.O. (Louisiana State U.) ; Hanson, J. (Louisiana State U.) ; Johnson, W.W. (Louisiana State U.) ; Liguori, N. (Padua U. ; INFN, Padua) ; Longo, S. (INFN, Padua) ; Maggiore, M. (Geneva U.) ; Marin, F. (INFN, Florence ; Florence U.) ; Marini, A. (Frascati) ; McHugh, M.P. (Loyola U., New Orleans) ; Mezzena, R. (INFN, Padua ; Trento U.) ; Miller, P. (Louisiana State U.) ; Minenkov, Y. (Gran Sasso) ; Mion, A. (INFN, Padua ; Trento U.) ; Modestino, G. (Frascati) ; Moleti, A. (Rome U. ; INFN, Rome) ; Nettles, D. (Louisiana State U.) ; Ortolan, A. (INFN, Legnaro) ; Pallottino, G.V. (INFN, Rome ; Rome U.) ; Pizzella, G. (Frascati) ; Poggi, S. (Unlisted, IT) ; Prodi, G.A. (INFN, Padua ; Trento U.) ; Re, V. (INFN, Padua ; Trento U.) ; Rocchi, A. (INFN, Rome) ; Ronga, F. (Frascati) ; Salemi, F. (Potsdam, Max Planck Inst.) ; Sturani, R. (Geneva U.) ; Taffarello, L. (Padua U.) ; Terenzi, R. (INFN, Rome) ; Vedovato, G. (INFN, Padua) ; Vinante, A. (Leiden U.) ; Visco, M. (Rome U. ; INAF, Rome) ; Vitale, S. (INFN, Padua ; Trento U.) ; Weaver, J. (Louisiana State U.) ; Zendri, J.P. (INFN, Padua) ; Zhang, P. (Louisiana State U.)
Publication	2010
Imprint	19 Feb 2010
Number of pages	10
Note	Comments: 10 pages, 8 figures 10 pages, 8 figures Accepted for publication on Phys. Rev. D
In:	Phys. Rev. D 82 (2010) 022003
DOI	10.1103/PhysRevD.82.022003
Subject category	General Relativity and Cosmology
Abstract	We present here the results of a 515 days long run of the IGEC2 observatory, consisting of the four resonant mass detectors ALLEGRO, AURIGA, EXPLORER and NAUTILUS. The reported results are related to the fourfold observation time from Nov. 6 2005 until Apr. 14 2007, when Allegro ceased its operation. This period overlapped with the first long term observations performed by the LIGO interferometric detectors. The IGEC observations aim at the identification of gravitational wave candidates with high confidence, keeping the false alarm rate at the level of 1 per century, and high duty cycle, namely 57% with all four sites and 94% with at least three sites in simultaneous observation. The network data analysis is based on time coincidence searches over at least three detectors: the four 3-fold searches and the 4-fold one are combined in a logical OR. We exchanged data with the usual blind procedure, by applying a unique confidential time offset to the events in each set of data. The accidental background was investigated by performing sets of 10^8 coincidence analyses per each detector configuration on off-source data, obtained by shifting the time series of each detector. The thresholds of the five searches were tuned so as to control the overall false alarm rate to 1/century. When the confidential time shifts was disclosed, no gravitational wave candidate was found in the on-source data. As an additional output of this search, we make available to other observatories the list of triple coincidence found below search thresholds, corresponding to a false alarm rate of 1/month.
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