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

Soares-Santos, M. and Holz, D.~E. and Annis, J. and Chornock, R. and Herner, K. and Berger, E. and Brout, D. and Chen, H.-Y. and Kessler, R. and Sako, M. and Allam, S. and Tucker, D.~L. and Butler, R.~E. and Palmese, A. and Doctor, Z. and Diehl, H.~T. and Frieman, J. and Yanny, B. and Lin, H. and Scolnic, D. and Cowperthwaite, P. and Neilsen, E. and Marriner, J. and Kuropatkin, N. and Hartley, W.~G. and Paz-Chinch_s14on, F. and Alexander, K.~D. and Balbinot, E. and Blanchard, P. and Brown, D.~A. and Carlin, J.~L. and Conselice, C. and Cook, E.~R. and Drlica-Wagner, A. and Drout, M.~R. and Durret, F. and Eftekhari, T. and Farr, B. and Finley, D.~A. and Foley, R.~J. and Fong, W. and Fryer, C.~L. and Garc_s14ia-Bellido, J. and Gill, M.~S.~S. and Gruendl, R.~A. and Hanna, C. and Kasen, D. and Li, T.~S. and Lopes, P.~A.~A. and Lourenc co, A.~C.~C. and Margutti, R. and Marshall, J.~L. and Matheson, T. and Medina, G.~E. and Metzger, B.~D. and Mu~noz, R.~R. and Muir, J. and Nicholl, M. and Quataert, E. and Rest, A. and Sauseda, M. and Schlegel, D.~J. and Secco, L.~F. and Sobreira, F. and Stebbins, A. and Villar, V.~A. and Vivas, K. and Walker, A.~R. and Wester, W. and Williams, P.~K.~G. and Zenteno, A. and Zhang, Y. and Abbott, T.~M.~C. and Abdalla, F.~B. and Banerji, M. and Bechtol, K. and Benoit-L_s14evy, A. and Bertin, E. and Brooks, D. and Buckley-Geer, E. and Burke, D.~L. and Carnero Rosell, A. and Carrasco Kind, M. and Carretero, J. and Castander, F.~J. and Crocce, M. and Cunha, C.~E. and D_s14Andrea, C.~B. and da Costa, L.~N. and Davis, C. and Desai, S. and Dietrich, J.~P. and Doel, P. and Eifler, T.~F. and Fernandez, E. and Flaugher, B. and Fosalba, P. and Gaztanaga, E. and Gerdes, D.~W. and Giannantonio, T. and Goldstein, D.~A. and Gruen, D. and Gschwend, J. and Gutierrez, G. and Honscheid, K. and Jain, B. and James, D.~J. and Jeltema, T. and Johnson, M.~W.~G. and Johnson, M.~D. and Kent, S. and Krause, E. and Kron, R. and Kuehn, K. and Kuhlmann, S. and Lahav, O. and Lima, M. and Maia, M.~A.~G. and March, M. and McMahon, R.~G. and Menanteau, F. and Miquel, R. and Mohr, J.~J. and Nichol, R.~C. and Nord, B. and Ogando, R.~L.~C. and Petravick, D. and Plazas, A.~A. and Romer, A.~K. and Roodman, A. and Rykoff, E.~S. and Sanchez, E. and Scarpine, V. and Schubnell, M. and Sevilla-Noarbe, I. and Smith, M. and Smith, R.~C. and Suchyta, E. and Swanson, M.~E.~C. and Tarle, G. and Thomas, D. and Thomas, R.~C. and Troxel, M.~A. and Vikram, V. and Wechsler, R.~H. and Weller, J. and Dark Energy Survey and Dark Energy Camera GW-EM Collaboration