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Hardwick, The LIGO Scientific Collaboration, the Virgo Collaboration: R. Abbott, T. Hinderer, T. Huynh-Dinh, T. Jacqmin, T. J. Cullen, T. J. Hansen, T. J. Massinger, T. J. N. Nelson, T. J. Slaven-Blair, T. L. Lam, T. McRae, T. M. Evans, T. Mistry, T. P. Downes, T. Prestegard, T. R. Corbitt, T. Regimbau, T. R. Saravanan, T. Sadecki, T. Shaffer, T. Souradeep, T. Tsutsui, T. Vo, T. Zelenova, T. Zhang, T. Z. Summerscales, V. Avendano, V. B. Adya, V. Boschi, V. Bossilkov, V. Dattilo, V. D'Emilio, V. Fafone, V. Fiumara, V. Frey, V. Gayathri, V. Hui, V. J. Roma, V. Kalogera, V. Kondrashov, V. Kringel, V. Loriette, V. Mandic, V. Mangano, V. Martinez, V. Pierro, V. P. Mitrofanov, V. Quetschke, V. Raymond, V. Savant, V. Sequino, V. Sipala, V. Skliris, V. Sordini, V. Srivastava, V. Sudhir, V. Tiwari, V. Varma, V. V. Frolov, W. Del Pozzo, W. G. Anderson, W. H. Wang, W. Kastaun, W. Katzman, W. Kim, W. M. Farr, W. Parker, W. Plastino, W. S. Kim, W. Winkler, W. Z. Korth, X. Chen, X. Fan, X. J. Zhu, X. Li, X. Liu, Y. Asali, Y. Boetzel, Y. Bouffanais, Y. Chen, Y. Guo, Y. Huang, Y. K. Lecoeuche, Y. Levin, Y. Ma, Y. Minenkov, Y.-M. Kim, Y. Setyawati, Y. Yang, Z. A. Khan, Z. A. Warden, Z. B. Etienne, Z. Doctor, Z. Du, Z. Frei, Z. M\\'arka, Z. Tornasi, Z. Yang, Z. Zhou","submitted_at":"2020-06-22T20:56:34Z","abstract_excerpt":"We report the observation of a compact binary coalescence involving a 22.2 - 24.3 $M_{\\odot}$ black hole and a compact object with a mass of 2.50 - 2.67 $M_{\\odot}$ (all measurements quoted at the 90$\\%$ credible level). The gravitational-wave signal, GW190814, was observed during LIGO's and Virgo's third observing run on August 14, 2019 at 21:10:39 UTC and has a signal-to-noise ratio of 25 in the three-detector network. The source was localized to 18.5 deg$^2$ at a distance of $241^{+41}_{-45}$ Mpc; no electromagnetic counterpart has been confirmed to date. 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Koekoek, G. Kuehn, G. L. Mansell, G. Losurdo, G. Lovelace, G. Mendell, G. M. Guidi, G. M. Harry, G. Mitselmakher, G. Mo, G. Moreno, G. Nelemans, G. Oganesyan, G. Pagano, G. Pagliaroli, G. Pillant, G. Pratten, G. Raaijmakers, G. Riemenschneider, G. R. Johns, G. Rutins, G. S. Davies, G. Stratta, G. S. Wallace, G. Traylor, G. Vajente, G. Valdes, G. Vedovato, G. Venugopalan, G. Woan, G. Zhao, H. A. Gabbard, Hang Yu, Haocun Yu, H. Cao, H. Estelles, H. Fong, H. Grote, H. Heitmann, H. Inchauspe, H. J. Bulten, H. K. Gulati, H. L. Griggs, H. L\\\"uck, H. Masalehdan, H. Miao, H. Middleton, H. M. Lee, H. Ohta, H. Overmier, H. Pan, H.-P. Cheng, H. P. Pfeiffer, H. Qi, H. Radkins, H. Rafferty, H. S. Cho, H. Shen, H. Vahlbruch, H. Vocca, H. Wittel, H. W. Lee, H. Yamamoto, H. Y. Chen, H. Y. Chia, I. A. Bilenko, I. A. O. MacMillan, I. Bartos, I. Belahcene, I. Cordero-Carri\\'on, I. Dave, I. Di Palma, I. Dorrington, I. Ferrante, I. Fiori, I. Khan, I. La Rosa, I. Maga\\~na Hernandez, I. Maksimovic, I. 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Neilson, J. N. Linley, J. Oberling, J.-P. Coulon, J. Petermann, J. Powell, J.-P. Zendri, J.-R. Cudell, J. Read, J. R. Gair, J. R. Palamos, J. R. Sanders, J. R. Smith, J. S. Areeda, J. Scheuer, J. Scott, J. S. Key, J. S. Kissel, J. Smetana, J. Steinhoff, J. Steinlechner, J. Suresh, J. T. Whelan, J. Veitch, J. V. van Heijningen, J. Warner, J. Watchi, J. Woehler, J. W. Richardson, J. W. Westhouse, J.-Y. Vinet, J. Zhang, J. Z. Wang, J. Zweizig, K. Ackley, K. Agatsuma, K. Arai, K. A. Santiago, K. A. Strain, K. A. Thorne, K. AultONeal, K. Barkett, K. C. Cannon, K. Chakravarti, K. Chatziioannou, K. Danzmann, K. D. Giardina, K. E. Ramirez, K. G. Arun, K. Gill, K. Haris, K. Haughian, K. Holt, K. Jani, K. Kawabe, K. Kim, K. L. Dooley, K. Lee, K. Li, K. Mason, K. Merfeld, K. Mogushi, K. Piotrzkowski, K. Prasai, K. Rao, K. R. Corley, K. Riles, K. Rose, K. Ryan, K. Shukla, K. Siellez, K. S. Phukon, K. Staats, K. Toland, K. Ueno, K. Venkateswara, K. W. Chung, K. Wette, K. W. Tsang, K. Y. Ng, L. Aiello, L. Barsotti, L. Cadonati, L. Conti, L. Cunningham, L. Di Fiore, L. E. H. Datrier, L. Errico, L. E. Sanchez, L. E. Wade, L. F. Ortega, L. Gergely, L. Haegel, L. Ju, L. Kleybolte, L. K. Nuttall, L. Kuo, L. McCuller, L. M. Daneshgaran-Bajastani, L. M. DeMarchi, L. Mereni, L. Milano, L. Naticchioni, L. Pinard, L. Prokhorov, L. P. Singer, L. Rei, L. Rolland, L. Salconi, L. Sun, L. Terkowski, L. T. London, L. Tsukada, L. van der Schaaf, L. Wallace, L. Wen, L.-W. Wei, L. Xiao, L. Yang, L. Zhang, M. A. Bizouard, M. Agathos, M. A. Okada, M. A. Page, M. Ar\\`ene, M. Barsuglia, M. Bawaj, M. Bazzan, M. Bejger, M. Bischi, M. Bitossi, M. Boer, M. Branchesi, M. Breschi, M. Brinkmann, M. Cabero, M. Canepa, M. C. Araya, M. Cavagli\\`a, M. C. D\\'iaz, M. Chan, M. Chaturvedi, M. C. Heintze, M. Cho, M. Cie{\\'s}lar, M. C. Milovich-Goff, M. Colleoni, M. Colpi, M. Constancio Jr., M. Croquette, M. C. Tringali, M. Curylo, M. Davier, M. Deenadayalan, M. De Laurentis, M. Delfavero, M. D. Hannam, M. Diaz-Ortiz Jr., M. Di Giovanni, M. Drago, M. Eisenmann, M. Evans, M. E. Zucker, M. Favata, M. Fays, M. Fazio, M. F. Carney, M. Fishbach, M. Fitz-Axen, M. Fyffe, M. G. Benjamin, M. Gosselin, M. Granata, M. Haney, M. Hendry, M. Heurs, M. Isi, M. J. Cowart, M. J. Szczepa\\'nczyk, M. J. Yap, M. Kasprzack, M. Khursheed, M. Kinley-Hanlon, M. K. M. Bader, M. Korobko, M. Kovalam, M. Landry, M. Laxen, M. Llorens-Monteagudo, M. Lorenzini, M. Lormand, M. MacInnis, M. Manske, M. Mantovani, M. Mapelli, M. Masso-Reid, M. Mehmet, M. Merzougui, M. M. Fejer, M. M. Hanke, M. Millhouse, M. Molina-Ruiz, M. Mondin, M. Montani, M. Nery, M. Noh, M. Oliver, M. Pedraza, M. Phelps, M. Pichot, M. Piendibene, M. Pirello, M. Pitkin, M. Principe, M. P. Ross, M. P. Thirugnanasambandam, M. Punturo, M. P\\\"urrer, M. Rakhmanov, M. Razzano, M. Rizzo, M. Romanelli, M. Sakellariadou, M. Saleem, M. Scheel, M. Shikauchi, M. Sieniawska, M. Spera, M. S. Shahriar, M. Standke, M. Steinke, M. Stover, M. Tacca, M. T\\'apai, M. 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Frasca, S. Galaudage, S. Gaudio, S. G. Crowder, S. G. Gaonkar, S. Ghonge, S. Ghosh, S. Gras, S. G. Rosofsky, S. Grunewald, S. H. Huttner, S. Hild, S. Hochheim, S. H. Oh, S. H. R. Yuen, Shubhanshu Tiwari, S. Husa, S. J. Cooper, S. J. Grimm, S. J. Jadhav, S. J. Kapadia, S. J. Rowlinson, S. Kandhasamy, S. Karki, S. Katsanevas, S. Kaufer, S. Khadka, S. Khan, S. Klimenko, S. Koley, S. Kumar, S. L. Danilishin, S. Leavey, S. Macfoy, S. M\\'arka, S. M. Aronson, S. Marsat, S. M. Aston, S. Mastrogiovanni, S. McCormick, S. Meshkov, S. M. Gaebel, S. Mitra, S. M. Koehlenbeck, S. Morisaki, S. Mozzon, S. M. Scott, S. Mukherjee, S. Ng, S. Nissanke, S. Ossokine, Soumen Roy, S. Penn, S. Perri\\`es, S. P. Jadhav, S. Ponrathnam, S. P. Vyatchanin, S. Raja, S. Reid, S. R. Mohite, S. Rowan, S. R. P. Mohapatra, S. R. Thondapu, S. Sachdev, S. Sayah, S. S. Eikenberry, S. ShyamSundar, S. Somala, S. Soni, S. Steinlechner, S. Stevenson, S. Sudhagar, S. Sunil, S. T. Countryman, S. Tiwari, S. T. McWilliams, Subroto Mukherjee, S. V. Angelova, S. Vass, S. Vinciguerra, S. Vitale, S. Walsh, S. Wang, S. W. Ballmer, S. Y. Hoback, T. A. Callister, T. A. Ferreira, T. B. Edo, T. B. Littenberg, T. Briant, T. Bulik, T. C. Pechsiri, T. D. Abbott, T. Dal Canton, T. D. Creighton, T. Dent, T. Dietrich, T. Di Girolamo, T. D. Knowles, T. Etzel, T. G. F. Li, T. Harder, T. Hardwick, The LIGO Scientific Collaboration, the Virgo Collaboration: R. Abbott, T. Hinderer, T. Huynh-Dinh, T. Jacqmin, T. J. Cullen, T. J. Hansen, T. J. Massinger, T. J. N. Nelson, T. J. Slaven-Blair, T. L. Lam, T. McRae, T. M. Evans, T. Mistry, T. P. Downes, T. Prestegard, T. R. Corbitt, T. Regimbau, T. R. Saravanan, T. Sadecki, T. Shaffer, T. Souradeep, T. Tsutsui, T. Vo, T. Zelenova, T. Zhang, T. Z. Summerscales, V. Avendano, V. B. Adya, V. Boschi, V. Bossilkov, V. Dattilo, V. D'Emilio, V. Fafone, V. Fiumara, V. Frey, V. Gayathri, V. Hui, V. J. Roma, V. Kalogera, V. Kondrashov, V. Kringel, V. Loriette, V. Mandic, V. 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