Abbott, B. P.B. P.AbbottAbbott, R.R.AbbottAbbott, T. D.T. D.AbbottAbraham, S.S.AbrahamAcernese, F.F.AcerneseAckley, K.K.AckleyAdams, C.C.AdamsAdhikari, 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.AinAjith, P.P.AjithAllen, G.G.AllenAllocca, A.A.AlloccaAloy, M. A.M. A.AloyAltin, P. A.P. A.AltinAmato, A.A.AmatoAnanyeva, A.A.AnanyevaAnderson, S. B.S. B.AndersonAnderson, W. G.W. G.AndersonAngelova, S. V.S. V.AngelovaAntier, S.S.AntierAppert, S.S.AppertArai, K.K.AraiAraya, M. C.M. C.ArayaAreeda, J. S.J. S.AreedaArène, M.M.ArèneArnaud, N.N.ArnaudAscenzi, S.S.AscenziAshton, G.G.AshtonAston, S. M.S. M.AstonAstone, P.P.AstoneAubin, F.F.AubinAufmuth, P.P.AufmuthAultoneal, K.K.AultonealAustin, C.C.AustinAvendano, V.V.AvendanoAvila-Alvarez, A.A.Avila-AlvarezBabak, S.S.BabakBacon, P.P.BaconBadaracco, F.F.BadaraccoBader, M. K.M.M. K.M.BaderBae, S.S.BaeBaker, P. T.P. T.BakerBaldaccini, F.F.BaldacciniBallardin, G.G.BallardinBallmer, S. W.S. W.BallmerBanagiri, S.S.BanagiriBarayoga, J. C.J. C.BarayogaBarclay, S. E.S. E.BarclayBarish, B. C.B. C.BarishBarker, D.D.BarkerBarkett, K.K.BarkettBarnum, S.S.BarnumBarone, 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.BastiBawaj, M.M.BawajBayley, J. C.J. C.BayleyBazzan, M.M.BazzanBécsy, B.B.BécsyBejger, M.M.BejgerBelahcene, I.I.BelahceneBell, A. S.A. S.BellBeniwal, D.D.BeniwalBerger, B. K.B. K.BergerBergmann, G.G.BergmannBernuzzi, S.S.BernuzziBero, J. J.J. J.BeroBerry, C. P.L.C. P.L.BerryBersanetti, D.D.BersanettiBertolini, A.A.BertoliniBetzwieser, J.J.BetzwieserBhandare, R.R.BhandareBidler, J.J.BidlerBilenko, I. A.I. A.BilenkoBilgili, S. A.S. A.BilgiliBillingsley, G.G.BillingsleyBirch, J.J.BirchBirney, R.R.BirneyBirnholtz, O.O.BirnholtzBiscans, S.S.BiscansBiscoveanu, S.S.BiscoveanuBisht, A.A.BishtBitossi, M.M.BitossiBizouard, M. A.M. A.BizouardBlackburn, J. K.J. K.BlackburnBlair, C. D.C. D.BlairBlair, D. G.D. G.Blair2025-08-312025-08-312019-04-0110.3847/1538-4357/ab0e152-s2.0-85064437212https://d8.irins.org/handle/IITG2025/23326We present the results of a search for short- and intermediate-duration gravitational-wave signals from four magnetar bursts in Advanced LIGO's second observing run. We find no evidence of a signal and set upper bounds on the root sum squared of the total dimensionless strain (h <inf>rss</inf>) from incoming intermediate-duration gravitational waves ranging from 1.1 ×10^-22 at 150 Hz to 4.4 ×10^-22 at 1550 Hz at 50% detection efficiency. From the known distance to the magnetar SGR 1806-20 (8.7 kpc), we can place upper bounds on the isotropic gravitational-wave energy of 3.4 ×10⁴⁴ erg at 150 Hz assuming optimal orientation. This represents an improvement of about a factor of 10 in strain sensitivity from the previous search for such signals, conducted during initial LIGO's sixth science run. The short-duration search yielded upper limits of 2.1 ×10⁴⁴ erg for short white noise bursts, and 2.3 ×10⁴⁷ erg for 100 ms long ringdowns at 1500 Hz, both at 50% detection efficiency.truegravitational waves | stars: magnetarsArticlehttps://iopscience.iop.org/article/10.3847/1538-4357/ab0e15/pdf153843571 April 201940163arJournal40