Abbott, B. P.B. P.AbbottAbbott, R.R.AbbottAbbott, T. D.T. D.AbbottAbernathy, M. R.M. R.AbernathyAcernese, F.F.AcerneseAckley, K.K.AckleyAdams, C.C.AdamsAdams, T.T.AdamsAddesso, P.P.AddessoAdhikari, R. X.R. X.AdhikariAdya, V. B.V. B.AdyaAffeldt, C.C.AffeldtAgathos, M.M.AgathosAgatsuma, K.K.AgatsumaAggarwal, N.N.AggarwalAguiar, O. D.O. D.AguiarAiello, L.L.AielloAin, A.A.AinAllen, B.B.AllenAllocca, A.A.AlloccaAltin, P. A.P. A.AltinAnderson, S. B.S. B.AndersonAnderson, W. G.W. G.AndersonArai, K.K.AraiAraya, M. C.M. C.ArayaArceneaux, C. C.C. C.ArceneauxAreeda, J. S.J. S.AreedaArnaud, N.N.ArnaudArun, K. G.K. G.ArunAscenzi, S.S.AscenziAshton, G.G.AshtonAst, M.M.AstAston, S. M.S. M.AstonAstone, P.P.AstoneAufmuth, P.P.AufmuthAulbert, C.C.AulbertBabak, S.S.BabakBacon, P.P.BaconBader, M. K.M.M. K.M.BaderBaker, P. T.P. T.BakerBaldaccini, F.F.BaldacciniBallardin, G.G.BallardinBallmer, S. W.S. W.BallmerBarayoga, J. C.J. C.BarayogaBarclay, S. E.S. E.BarclayBarish, B. C.B. C.BarishBarker, D.D.BarkerBarone, F.F.BaroneBarr, B.B.BarrBarsotti, L.L.BarsottiBarsuglia, M.M.BarsugliaBarta, D.D.BartaBartlett, J.J.BartlettBartos, I.I.BartosBassiri, R.R.BassiriBasti, A.A.BastiBatch, J. C.J. C.BatchBaune, C.C.BauneBavigadda, V.V.BavigaddaBazzan, M.M.BazzanBejger, M.M.BejgerBell, A. S.A. S.BellBerger, B. K.B. K.BergerBergmann, G.G.BergmannBerry, C. P.L.C. P.L.BerryBersanetti, D.D.BersanettiBertolini, A.A.BertoliniBetzwieser, J.J.BetzwieserBhagwat, S.S.BhagwatBhandare, R.R.BhandareBilenko, I. A.I. A.BilenkoBillingsley, G.G.BillingsleyBirch, J.J.BirchBirney, R.R.BirneyBiscans, S.S.BiscansBisht, A.A.BishtBitossi, M.M.BitossiBiwer, C.C.BiwerBizouard, M. A.M. A.BizouardBlackburn, J. K.J. K.BlackburnBlair, C. D.C. D.BlairBlair, D. G.D. G.BlairBlair, R. M.R. M.BlairBloemen, S.S.BloemenBock, O.O.BockBoer, M.M.BoerBogaert, G.G.BogaertBogan, C.C.BoganBohe, A.A.BoheBond, C.C.BondBondu, F.F.BonduBonnand, R.R.BonnandBoom, B. A.B. A.BoomBork, R.R.BorkBoschi, V.V.BoschiBose, S.S.BoseBouffanais, Y.Y.BouffanaisBozzi, A.A.BozziBradaschia, C.C.BradaschiaBrady, P. R.P. R.Brady2025-08-302025-08-302017-04-1910.1103/PhysRevD.95.0820052-s2.0-85021659112https://d8.irins.org/handle/IITG2025/22492We describe a directed search for continuous gravitational waves in data from the sixth initial LIGO science run. The target was the nearby globular cluster NGC 6544 at a distance of ≈2.7 kpc. The search covered a broad band of frequencies along with first and second frequency derivatives for a fixed sky position. The search coherently integrated data from the two LIGO interferometers over a time span of 9.2 days using the matched-filtering F-statistic. We found no gravitational-wave signals and set 95% confidence upper limits as stringent as 6.0×10-25 on intrinsic strain and 8.5×10-6 on fiducial ellipticity. These values beat the indirect limits from energy conservation for stars with characteristic spin-down ages older than 300 years and are within the range of theoretical predictions for possible neutron-star ellipticities. An important feature of this search was use of a barycentric resampling algorithm which substantially reduced computational cost; this method is used extensively in searches of Advanced LIGO and Virgo detector data.falseArticlehttp://link.aps.org/pdf/10.1103/PhysRevD.95.0820052470002919 April 201722082005arJournal21