GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2.

@article{Abbott2017GW170104OO,
  title={GW170104: Observation of a 50-Solar-Mass Binary Black Hole Coalescence at Redshift 0.2.},
  author={Brad Abbott and Richard J. Abbott and Thomas Abbott and Fausto Acernese and Kendall Ackley and Carl Adams and Todd Adams and Paolo Addesso and Rana X. Adhikari and V B Adya and Christoph Affeldt and Mohammad Afrough and Bhanu Agarwal and Michalis Agathos and Kazuhiro Agatsuma and Nancy Aggarwal and Odylio D. Aguiar and Lloyd Paul Aiello and Anirban Ain and Parameswaran Ajith and Bruce Allen and Gabrielle Allen and Annalisa Allocca and Paul A Altin and A. Amato and Alena Ananyeva and Stuart B. Anderson and Warren G. Anderson and Sarah Antier and Stephen Appert and Koji Arai and M. C. Araya and Joseph Areeda and Nicolas Arnaud and K. G. Arun and Stefano Ascenzi and Gregory Ashton and Melanie Ast and Stuart M. Aston and Pia Astone and Peter Aufmuth and C. Aulbert and K. AultONeal and Adriana {\'A}vila-{\'A}lvarez and Stanislav Babak and Philippe Bacon and M. K. M. Bader and S Bae and Paul T. Baker and F. Baldaccini and Giulio Ballardin and Stefan W. Ballmer and Sharan Banagiri and J. C. B. Barayoga and S. E. Barclay and Barry C. Barish and Daniel H. N. Barker and Fabrizio Barone and B. W. Barr and Lisa Barsotti and Matteo Barsuglia and D{\'a}niel Barta and Jms Bartlett and Imre Bartos and Riccardo Bassiri and Andrea Basti and J. C. Batch and Christoph Baune and Mateusz Bawaj and Marco Bazzan and Bence B{\'e}csy and C. Beer and Michał Bejger and I. Belahcene and A. S. Bell and B. K. Berger and Gerald Bergmann and Christopher P. L. Berry and Diego Bersanetti and Alessandro Bertolini and J Betzwieser and Swetha Bhagwat and R. Bhandare and I. A. Bilenko and G Billingsley and Chris Billman and Jeremy Birch and R Birney and Ofek Birnholtz and Sebastien Biscans and A. Bisht and Massimiliano Bitossi and Christopher Michael Biwer and M. A. Bizouard and J. K. Blackburn and Jonathan Blackman and Carl Blair and David G Blair and R. M. Blair and Steven Bloemen and Oliver Bock and Nina Bode and Michel Boer and Gilles Bogaert and Alejandro Boh{\'e} and F. Bondu and Romain Bonnand and Boris A. Boom and R. G. Bork and Valerio Boschi and Sukanta Bose and Yann Bouffanais and Aaron T. Bozzi and C. Bradaschia and P. R. Brady and Vladimir B. Braginsky and Marica Branchesi and James E. Brau and Tristan Briant and A. Brillet and Martin Brinkmann and V. Brisson and Patrick Brockill and J. E. Broida and A. F. Brooks and D. A. Brown and D D Brown and Nic M. Brown and Sharon Brunett and C. C. Buchanan and Aaron Buikema and Tomasz Bulik and H. J. Bulten and Alessandra Buonanno and D. Buskulic and Christelle Buy and R. L. Byer and Miriam Cabero and Laura Cadonati and Gianpietro Cagnoli and C. Cahillane and Juan Calder{\'o}n Bustillo and Thomas A. Callister and Enrico Calloni and Jordan B. Camp and Maurizio Canepa and Priscilla Canizares and Kipp Cannon and H. Cao and J. Cao and C. D. Capano and E. Capocasa and Franco Carbognani and Santiago Caride and Matthew Carney and Julia Casanueva Diaz and Claudio Casentini and Sarah Caudill and Marco Cavagli{\`a} and F. Cavalier and R. Cavalieri and Giancarlo Cella and Carlos Cepeda and Lorenzo Cerboni Baiardi and G. Cerretani and Elisa Cesarini and Sydney JoAnne Chamberlin and Man Leong Chan and S. Chao and P R Charlton and {\'E}ric Chassande-Mottin and Deep Chatterjee and Katerina Chatziioannou and Belinda D. Cheeseboro and H. Y. Chen and Y. R. Chen and H.-P. Cheng and Andrea Chincarini and Antonino Chiummo and T. Chmiel and H. S. Cho and M. Cho and Jong H. Chow and Nelson Christensen and Qi Chu and Alvin J. K. Chua and Sheon S Y Chua and Adrian Ka-Wai Chung and S. Chung and Giacomo Ciani and Riccardo Ciolfi and Caterina Cirelli and A Cirone and Filiberto Clara and J A Clark and F. Cleva and Candida Gori Cocchieri and Eliana Marina Coccia and P.-F. Cohadon and Alberto Colla and Christophe Collette and Lynn R. Cominsky and Marcio Constancio and L Conti and S J Cooper and P. Corban and T. R. Corbitt and K. Rainer Corley and Neil J. Cornish and Alessandra Corsi and Samuele Cortese and C. A. Costa and Michael W. Coughlin and S Coughlin and J.-P. Coulon and Stefanie Countryman and Peter Couvares and P. B. Covas and Edith Cowan and D. M. Coward and M. J. Cowart and D. C. Coyne and Robert Coyne and Jolien D. E. Creighton and T. D. Creighton and Jonathan Cripe and S. Gwynne Crowder and Torrey Cullen and Andrew Cumming and L. Cunningham and Elena Cuoco and Tito Dal Canton and S L Danilishin and Sabrina D’Antonio and Karsten Danzmann and Abhigyan Dasgupta and C F Da Silva Costa and Vincenzino Dattilo and Itishri Dave and M. Davier and Derek Davis and E J Daw and B. Day and Soumi De and Daniel B. DeBra and Ewa Deelman and J{\'e}r{\^o}me Degallaix and M. De Laurentis and Samuel Deleglise and Walter Del Pozzo and Thomas Denker and Thomas Dent and Vladimir Dergachev and Rosario De Rosa and R. T. Derosa and Riccardo DeSalvo and Jan Devenson and R. C. Devine and Sanjeev V. Dhurandhar and M. C. D{\'i}az and Luciano Di Fiore and M. Di Giovanni and Tristano Di Girolamo and Alberto Di Lieto and Sibilla Di Pace and I. Di Palma and Francesco di Renzo and Zoheyr Doctor and Vincent Dolique and Frederick J. Donovan and K L Dooley and Suresh Doravari and Iain Dorrington and Rebecca Douglas and M Dovale {\'A}lvarez and Turlough P. Downes and M. Drago and Ronald W. P. Drever and J C Driggers and Zhihui Du and M. Ducrot and J. Duncan and Sheila E. Dwyer and Tega Boro Edo and Matthew C. Edwards and Anamaria Effler and H. B. Eggenstein and Phil Ehrens and Jan Eichholz and Stephen S. Eikenberry and Robert A. Eisenstein and Reed Essick and Zachariah B. Etienne and Taylor M. Etzel and Matthew Evans and Thomas M. Evans and Maxim Factourovich and V Fafone and H. Fair and Stephen Fairhurst and X. Fan and Stefania Farinon and Benjamin Farr and Will M. Farr and E Fauchon-Jones and Marc Favata and Maxime Fays and H. Fehrmann and Jon R. Feicht and Martin M. Fejer and {\'A}lvaro Fern{\'a}ndez-Galiana and I. Ferrante and E.C. Ferreira and Federico Ferrini and Francesco Fidecaro and Irene Fiori and Donatella Fiorucci and Rebecca Fisher and R. Flaminio and Mark Fletcher and Heather Fong and P W F Forsyth and Sophie Forsyth and J.-D. Fournier and Sergio Frasca and F. Frasconi and Zsolt Frei and Andreas Freise and Raymond E. Frey and Volker Frey and Erin Murphy Fries and P. Fritschel and Valery Victor Frolov and P. J. Fulda and Matthew Fyffe and Hunter Gabbard and Medard Gabel and Bhooshan Gadre and Sebastian M. Gaebel and Jonathan R. Gair and Luca Gammaitoni and Miftar Ganija and Sampada Gaonkar and F. Garufi and Sergio Del Gaudio and G. Gaur and V. Gayathri and N. C. Gehrels and Gianluca Gemme and Emmanuelle G{\'e}nin and A. Gennai and Daniel George and Julia George and L'aszl'o 'A. Gergely and Vincent Germain and Sudarshan Ghonge and Abhirup Ghosh and Archisman Ghosh and S. Ghosh and J. A. Giaime and K. D. Giardina and A. Giazotto and Karl Gill and Lamar Glover and Evan Goetz and Ryan P. Goetz and S. Gomes and Gabriela Gonz{\'a}lez and J. M. Gonzalez Castro and A. Gopakumar and Michael L. Gorodetsky and Sarah E. Gossan and Matthieu Gosselin and R. Gouaty and Aniello Grado and Christian Graef and Massimo Granata and A. Grant and Slawomir Gras and C. Gray and Giuseppe Greco and Andrew Green and Paul J. Groot and Hartmut Grote and S. Grunewald and P. Gruning and G. Guidi and X. Guo and A. Gupta and M. Gupta and Kaitlin E. Gushwa and E. K. Gustafson and Richard Gustafson and Bernard Hall and Evan D. Hall and Giles D. Hammond and Maria Haney and M. M. Hanke and Jonathan Hanks and Chad Hanna and Mark Hannam and Otto A. Hannuksela and James E. Hanson and T Hardwick and Jan Harms and Gregory M. Harry and I. W. Harry and M. J. Hart and Carl-Johan Haster and K. Haughian and James Healy and Antoine Heidmann and Matthew Heintze and H. Heitmann and P. Hello and Gary Hemming and Martin Hendry and Ik Siong Heng and John Hennig and J. P. Henry and Alastair Heptonstall and Mich{\`e}le Heurs and Stefan Hild and David C. Hoak and David Jonathan Hofman and K. Holt and Daniel E. Holz and Philip F. Hopkins and C. Horst and James Hough and E. Alasdair Houston and E J Howell and Yi-ming Hu and Eliu A. Huerta and Dominique Huet and Barbara J. Hughey and Sascha Husa and S. H. Huttner and T. Huynh--Dinh and Nathaniel M. Indik and D. R. Ingram and Ra Inta and Giuseppe Intini and Hafizah Noor Isa and J. M. Isac and Maximiliano Isi and Bala R. Iyer and Kiwamu Izumi and T. Jacqmin and Karan Jani and Piotr Jaranowski and S. Jawahar and F. Jim{\'e}nez-Forteza and W. W. Johnson and Nathan K. Johnson-McDaniel and D. I. Jones and R. Jones and R. J. G. Jonker and Li Ju and Jonas Junker and Chinmay Kalaghatgi and Vassiliki Kalogera and S Kandhasamy and G. Kang and Jonah Kanner and Sudarshan Karki and Kai S. Karvinen and Marie Kasprzack and M. Katolik and Erotokritos Katsavounidis and William G. Katzman and Steffen Kaufer and Keita Kawabe and Fabien K{\'e}f{\'e}lian and David Keitel and Athol J. Kemball and Ross Kennedy and C. Kent and Joey Shapiro Key and F. Ya. Khalili and I Khan and S. A. Khan and Z. A. Khan and E. A. Khazanov and N Kijbunchoo and Chunglee Kim and J. C. Kim and W. S. Kim and W. S. Kim and Y.-M. Kim and Seth J. Kimbrell and Eleanor J King and P. J. King and R Kirchhoff and J S Kissel and L. Kleybolte and Sergey Klimenko and Patrick M. Koch and S. M. Koehlenbeck and Soumen Koley},
  journal={Physical review letters},
  year={2017},
  volume={118 22},
  pages={
          221101
        }
}
We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10∶11:58.6 UTC by the twin advanced detectors of the Laser Interferometer Gravitational-Wave Observatory during their second observing run, with a network signal-to-noise ratio of 13 and a false alarm rate less than 1 in 70 000 years. The inferred component black hole masses are 31.2_{-6.0}^{+8.4}M_{⊙} and 19.4_{-5… 

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