The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. I. Dark Energy Camera Discovery of the Optical Counterpart

  title={The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/Virgo GW170817. I. Dark Energy Camera Discovery of the Optical Counterpart},
  author={Marcelle Soares-Santos and Daniel E. Holz and James T. Annis and Ryan Chornock and Ken Herner and Edo Berger and Dillon J. Brout and H. Y. Chen and Richard Kessler and Masao Sako and Sahar Allam and Douglas L. Tucker and Robert E. Butler and Antonella Palmese and Zoheyr Doctor and H. Thomas Diehl and Joshua A. Frieman and Brian Yanny and H. Lin and Dan Scolnic and Philip S. Cowperthwaite and Eric H. Neilsen and John Marriner and Nikolay Kuropatkin and William G. Hartley and F. Paz-Chinch'on and Kate D. Alexander and Eduardo Balbinot and Peter K. Blanchard and D. A. Brown and Jeffrey L. Carlin and Christopher J. Conselice and Erika Cook and Alex Drlica-Wagner and Maria R. Drout and Florence Durret and Tarraneh Eftekhari and Benjamin Farr and David A. Finley and Ryan J. Foley and Wen-fai Fong and Christopher L. Fryer and Juan Garc'ia-Bellido and Mandeep S. S. Gill and Robert A. Gruendl and Chad Hanna and Daniel Kasen and T. S. Li and Paulo A. A. Lopes and Antonio C. Lourencco and Raffaella Margutti and Jennifer L. Marshall and Thomas Matheson and Gustavo E. Medina and Brian D. Metzger and Ricardo R. Mu{\~n}oz and J. Muir and Matt Nicholl and Eliot Quataert and Armin Rest and Marcus Sauseda and David J. Schlegel and Lucas F. Secco and Flavia Sobreira and Albert Stebbins and V. Ashley Villar and Alistair R. Walker and W. C. Iii Wester and Peter K. G. Williams and A. Zenteno and Y. Zhang and Timothy M. C. Abbott and Filipe B. Abdalla and Manda Banerji and Keith C. Bechtol and Aur{\'e}lien Benoit-L{\'e}vy and Emmanuel Bertin and David Brooks and Elizabeth Buckley-Geer and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Francisco J. Castander and Mart{\'i}n Crocce and Carlos E. Cunha and Chris D'Andrea and Luiz Nicolaci da Costa and C. Davis and Shantanu Desai and J. P. Dietrich and Peter Doel and T. F. Eifler and Enrique Fern{\'a}ndez and Brenna L. Flaugher and Pablo Fosalba and Enrique Gazta{\~n}aga and David W. Gerdes and T. Giannantonio and Daniel A. Goldstein and Daniel Gruen and Julia Gschwend and Gaston R. Guti{\'e}rrez and Klaus Honscheid and B. Jain and David J. James and Tesla E. Jeltema and M. W. G. Johnson and M. D. Johnson and Stephen Kent and E. Krause and Richard G. Kron and Kyler W. Kuehn and Stephen E. Kuhlmann and Ofer Lahav and Marcos Lima and Marcio A. G. Maia and M March and Richard G. McMahon and Felipe Menanteau and Ramon Miquel and Joseph J. Mohr and Robert C. Nichol and Brian Nord and R. L. C. Ogando and Don Petravick and Andreas Alejandro Plazas and A. K. Romer and Aaron Roodman and Eli S. Rykoff and Eusebio S{\'a}nchez and Victor E. Scarpine and Michael S. Schubnell and Ignacio Sevilla-Noarbe and M. Smith and R. C. Smith and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and D. Thomas and R. C. Thomas and Michael Troxel and Vinu Vikram and Risa H. Wechsler and Jochen Weller},
  journal={arXiv: High Energy Astrophysical Phenomena},
We present the Dark Energy Camera (DECam) discovery of the optical counterpart of the first binary neutron star merger detected through gravitational wave emission, GW170817. Our observations commenced 10.5 hours post-merger, as soon as the localization region became accessible from Chile. We imaged 70 deg$^2$ in the $i$ and $z$ bands, covering 93\% of the initial integrated localization probability, to a depth necessary to identify likely optical counterparts (e.g., a kilonova). At 11.4 hours… 

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