Abbott, 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.AguiarAich, A.A.AichAiello, L.L.AielloAin, A.A.AinAjith, P.P.AjithAkcay, S.S.AkcayAllen, G.G.AllenAllocca, A.A.AlloccaAltin, P. A.P. A.AltinAmato, A.A.AmatoAnand, S.S.AnandAnanyeva, A.A.AnanyevaAnderson, S. B.S. B.AndersonAnderson, W. G.W. G.AndersonAngelova, S. V.S. V.AngelovaAnsoldi, S.S.AnsoldiAntier, S.S.AntierAppert, S.S.AppertArai, K.K.AraiAraya, M. C.M. C.ArayaAreeda, J. S.J. S.AreedaArène, M.M.ArèneArnaud, N.N.ArnaudAronson, S. M.S. M.AronsonArun, K. G.K. G.ArunAsali, Y.Y.AsaliAscenzi, 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.AvendanoBabak, S.S.BabakBacon, P.P.BaconBadaracco, F.F.BadaraccoBader, M. K.M.M. K.M.BaderBae, S.S.BaeBaer, A. M.A. M.BaerBaird, J.J.BairdBaldaccini, F.F.BaldacciniBallardin, G.G.BallardinBallmer, S. W.S. W.BallmerBals, A.A.BalsBalsamo, A.A.BalsamoBaltus, G.G.BaltusBanagiri, S.S.BanagiriBankar, D.D.BankarBankar, R. S.R. S.BankarBarayoga, J. C.J. C.BarayogaBarbieri, C.C.BarbieriBarish, B. C.B. C.BarishBarker, D.D.BarkerBarkett, K.K.BarkettBarneo, P.P.BarneoBarone, 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.BeniwalBenjamin, M. G.M. G.BenjaminBentley, J. D.J. D.BentleyBergamin, F.F.BergaminBerger, B. K.B. K.BergerBergmann, G.G.BergmannBernuzzi, S.S.BernuzziBerry, C. P.L.C. P.L.BerryBersanetti, D.D.BersanettiBertolini, A.A.BertoliniBetzwieser, J.J.BetzwieserBhandare, R.R.BhandareBhandari, A. V.A. V.BhandariBidler, J.J.BidlerBiggs, E.E.Biggs2025-08-312025-08-312020-09-0410.1103/PhysRevLett.125.1011022-s2.0-85091469786http://repository.iitgn.ac.in/handle/IITG2025/2401232955328On May 21, 2019 at 03:02:29 UTC Advanced LIGO and Advanced Virgo observed a short duration gravitational-wave signal, GW190521, with a three-detector network signal-to-noise ratio of 14.7, and an estimated false-alarm rate of 1 in 4900 yr using a search sensitive to generic transients. If GW190521 is from a quasicircular binary inspiral, then the detected signal is consistent with the merger of two black holes with masses of 85-14+21 Mm and 66-18+17 Mm (90% credible intervals). We infer that the primary black hole mass lies within the gap produced by (pulsational) pair-instability supernova processes, with only a 0.32% probability of being below 65 Mm. We calculate the mass of the remnant to be 142-16+28 Mm, which can be considered an intermediate mass black hole (IMBH). The luminosity distance of the source is 5.3-2.6+2.4 Gpc, corresponding to a redshift of 0.82-0.34+0.28. The inferred rate of mergers similar to GW190521 is 0.13-0.11+0.30 Gpc-3 yr-1.trueArticlehttp://link.aps.org/pdf/10.1103/PhysRevLett.125.101102107971144 September 20201074101102arJournal1054