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Diaz, M. C.; Macri, L. M.; Garcia Lambas, D.; Mendes de Oliveira, C.; Nilo Castellon, J. L.; Ribeiro, T.; Sanchez, B.; Schoenell, W.; Abramo, L. R.; Akras, S.; Alcaniz, J. S.; Artola, R.; Beroiz, M.; Bonoli, S.; Cabral, J.; Camuccio, R.; Castillo, M.; Chavushyan, V.; Coelho, P.; Colazo, C.; Costa-Duarte, M. V.; Cuevas Larenas, H.; Depoy, D. L.; Dominguez Romero, M.; Dultzin, D.; Fernandez, D.; Garcia, J.; Girardini, C.; Goncalves, D. R.; Goncalves, T. S.; Gurovich, S.; Jimenez-Teja, Y.; Kanaan, A.; Lares, M.; Lopes de Oliveira, R.; Lopez-Cruz, O.; Marshall, J. L.; Melia, R.; Molino, A.; Padilla, N.; Penuela, T.; Placco, V. M.; Quinones, C.; Ramirez Rivera, A.; Renzi, V.; Riguccini, L.; Rios-Lopez, E.; Rodriguez, H.; Sampedro, L.; Schneiter, M.; Sodre, L.; Starck, M.; Torres-Flores, S.; Tornatore, M.; Zadrozny, A. (2017): Observations of the First Electromagnetic Counterpart to a Gravitational-wave Source by the TOROS Collaboration. In: Astrophysical Journal Letters, Vol. 848, No. 2, L29
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We present the results of prompt optical follow-up of the electromagnetic counterpart of the gravitational-wave event GW170817 by the Transient Optical Robotic Observatory of the South Collaboration. We detected highly significant dimming in the light curves of the counterpart (Delta g= 0.17 +/- 0.03 mag, Delta r = 0.14 +/- 0.02 mag, Delta i = 0.10 +/- 0.03 mag) over the course of only 80 minutes of observations obtained similar to 35 hr after the trigger with the T80- South telescope. A second epoch of observations, obtained similar to 59 hr after the event with the EABA 1.5 m telescope, confirms the fast fading nature of the transient. The observed colors of the counterpart suggest that this event was a "blue kilonova" relatively free of lanthanides.