Title: The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. I. Discovery of the Optical Counterpart Using the Dark Energy Camera Authors: Soares-Santos M., Holz D.E., Annis J., Chornock R., Herner K., Berger E., Brout D., Chen H., Kessler R., Sako M., Allam S., Tucker D.L., Butler R.E., Palmese A., Doctor Z., Diehl H.T., Frieman J., Yanny B., Lin H., Scolnic D., Cowperthwaite P., Neilsen E., Marriner J., Kuropatkin N., Hartley W.G., Paz-Chinchon F., Alexander K.D., Balbinot E., Blanchard P., Brown D.A., Conselice C., Cook E.R., Drlica-Wagner A., Drout M.R., Durret F., Eftekhari T., Farr B., Finley D.A., Foley R.J., Fong W., Fryer C.L., Garcia-Bellido J., Gill M.S.S., Gruendl R.A., Hanna C., Kasen D., Kuropatkin N., Li T.S., Lopes P.A.A., Lourenco A.C.C., Margutti R., Marshall J.L., Matheson T., Medina G.E., Metzger B.D., Munoz R.R., Muir J., Nicholl M., Quataert E., Rest A., Sauseda M., Schlegel D.J., Secco L.F., Sobreira F., Stebbins A., Villar V.A., Walker A.R., Wester W., Williams P.K.G., Zenteno A., Abbott T.M.C., Abdalla F.B., Banerji M., Bechtol K., Benoit-Levy A., Bertin E., Brooks D., Buckley-Geer E., Burke D.L., Rosell A.C., Kind M.C., Carretero J., Castander F.J., Crocce M., Cunha C.E., D'Andrea C.B., da Costa L.N., Davis C., Desai S., Dietrich J.P., Doel P., Eifler T.F., Fernandez E., Flaugher B., Fosalba P., Gaztanaga E., Gerdes D.W., Giannantonio T., Goldstein D.A., Gruen D., Gschwend J., Gutierrez G., Honscheid K., Jain B., James D.J., Jeltema T., Johnson M.W.G., Johnson M.D., Kent S., Krause E., Kron R., Kuehn K., Kuhlmann S., Lahav O., Lima M., Maia M.A.G., March M., McMahon R.G., Menanteau F., Miquel R., Mohr J.J., Nichol R.C., Nord B., Ogando R.L.C., Petravick D., Plazas A.A., Romer A.K., Roodman A., Rykoff E.S., Sanchez E., Scarpine V., Schubnell M., Sevilla-Noarbe I., Smith M., Smith R.C., Suchyta E., Swanson M.E.C., Tarle G., Thomas D., Thomas R.C., Troxel M.A., Vikram V., Wechsler R.H., Weller J., Zhang Y. Figure: The observed light curve for the optical counterpart of GW170817 measured in 6 filters ================================================================================ Byte-by-byte Description of file: apjlaa9059t1_mrt.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 F12.6 d MJD + Time of observation in Modified Julian Days 14 A1 --- Band [ugrizY] Band used for observation 16- 21 F6.3 mag mag Reddening corrected magnitude in Band 23- 27 F5.3 mag e_mag ? Error in mag (1) -------------------------------------------------------------------------------- Note (1): When value of the magnitude error is lower than 1e-2, it is not considered. -------------------------------------------------------------------------------- 57983.003059 i 17.274 0.005 57983.003741 z 17.419 0.007 57983.973954 Y 17.267 0.008 57983.974627 z 17.437 0.005 57983.975324 i 17.597 0.004 57983.976015 r 17.637 0.004 57983.976688 g 18.181 0.006 57983.977375 u 19.019 0.038 57984.974650 Y 17.711 0.014 57984.976389 i 18.206 0.010 57984.977079 r 18.590 0.011 57984.977768 g 19.836 0.025 57984.978804 u 21.185 0.237 57985.974995 Y 18.019 0.017 57985.976029 z 18.418 0.015 57985.976691 i 18.683 0.014 57985.977380 r 19.263 0.020 57985.978069 g 20.790 0.036 57985.980480 u 22.003 0.402 57986.975242 Y 18.311 0.013 57986.980076 i 19.042 0.007 57986.982491 r 19.872 0.010 57986.987296 g 21.470 0.036 57987.974538 Y 18.643 0.139 57987.976954 z 19.038 0.083 57987.979363 i 19.399 0.170 57987.981776 r 20.126 0.159 57987.986601 g 22.049 0.827 57988.982969 r 20.385 0.338 57989.969723 Y 19.457 0.027 57989.979392 z 19.824 0.030 57989.981810 i 20.390 0.030 57989.984225 r 21.617 0.062 57989.991454 g 22.885 0.145 57990.005913 u 22.202 0.766 57990.967129 Y 20.084 0.049 57990.981615 z 20.394 0.045 57990.991279 r 21.931 0.123 57991.967972 Y 20.743 0.076 57991.982785 z 21.058 0.048 57991.992425 i 21.618 0.058 57992.968656 Y 21.459 0.112 57992.983157 z 21.584 0.074 57993.968337 Y 22.226 0.330 57993.982794 z 22.687 0.274 57993.992450 i 22.404 0.145 57994.989637 z 21.862 0.180 57995.991085 z 25.237 2.649