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We detected highly significant dimming in the light curves of the counterpart (<jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjlaa9060ieqn1.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> mag, <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjlaa9060ieqn2.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> mag, <jats:inline-formula>\n                     <jats:tex-math>\n\n<\/jats:tex-math>\n                     <jats:inline-graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"apjlaa9060ieqn3.gif\" xlink:type=\"simple\"\/>\n                  <\/jats:inline-formula> mag) over the course of only 80 minutes of observations obtained \u223c35 hr after the trigger with the T80-South telescope. A second epoch of observations, obtained \u223c59 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 \u201cblue kilonova\u201d relatively free of lanthanides.<\/jats:p>","DOI":"10.3847\/2041-8213\/aa9060","type":"journal-article","created":{"date-parts":[[2017,10,16]],"date-time":"2017-10-16T14:15:54Z","timestamp":1508163354000},"page":"L29","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":122,"title":["Observations of the First Electromagnetic Counterpart to a Gravitational-wave Source by the TOROS Collaboration"],"prefix":"10.3847","volume":"848","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7555-8856","authenticated-orcid":false,"given":"M. C.","family":"D\u00edaz","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1775-4859","authenticated-orcid":false,"given":"L. 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