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arxiv: 1710.05844 · v1 · submitted 2017-10-16 · 🌌 astro-ph.HE · astro-ph.SR

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Observations of the first electromagnetic counterpart to a gravitational wave source by the TOROS collaboration

M.C. D\'iaz , L.M. Macri , D. Garcia Lambas , C. Mendes de Oliveira , J.L. Nilo Castell\'on , T. Ribeiro , B. S\'anchez , W. Schoenell
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L.R. Abramo S. Akras J.S. Alcaniz R. Artola M. Beroiz S. Bonoli J. Cabral R. Camuccio M. Castillo V. Chavushyan P. Coelho C. Colazo M.V. Costa-Duarte H. Cuevas Larenas D.L. Depoy M. Dom\'inguez Romero D. Dultzin D. Fern\'andez J. Garc\'ia C. Girardini D.R. Gon\c{c}alves T.S. Gon\c{c}alves S. Gurovich Y. Jim\'enez-Teja A. Kanaan M. Lares R. Lopes de Oliveira O. L\'opez-Cruz J.L. Marshall R. Melia A. Molino N. Padilla T. Pe\~nuela V.M. Placco C. Qui\~nones A. Ram\'irez Rivera V. Renzi L. Riguccini E. R\'ios-L\'opez H. Rodriguez L. Sampedro M. Schneiter L. Sodr\'e M. Starck S. Torres-Flores M. Tornatore A. Zadro\.zny
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classification 🌌 astro-ph.HE astro-ph.SR
keywords counterpartdeltaeventobservationscollaborationelectromagneticobtainedoptical
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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 (TOROS). 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 ~35 hr after the trigger with the T80-South telescope. A second epoch of observations, obtained ~59 hr after the event with the EABA 1.5m 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.

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