{
  "id": "1607.07850",
  "version": "v1",
  "published": "2016-07-26T19:22:36.000Z",
  "updated": "2016-07-26T19:22:36.000Z",
  "title": "GW150914: First search for the electromagnetic counterpart of a gravitational-wave event by the TOROS collaboration",
  "authors": [
    "Mario C. Díaz",
    "Martín Beroiz",
    "Tania Peñuela",
    "Lucas M. Macri",
    "Ryan J. Oelkers",
    "Wenlong Yuan",
    "Diego García Lambas",
    "Juan Cabral",
    "Carlos Colazo",
    "Mariano Domínguez",
    "Bruno Sánchez",
    "Sebastián Gurovich",
    "Marcelo Lares",
    "Matías Schneiter",
    "Darío Graña",
    "Victor Renzi",
    "Horacio Rodriguez",
    "Manuel Starck",
    "Rubén Vrech",
    "Rodolfo Artola",
    "Antonio Chiavassa Ferreyra",
    "Carla Girardini",
    "Cecilia Quiñones",
    "Luis Tapia",
    "Marina Tornatore",
    "Jennifer L. Marshall",
    "Darren L. DePoy",
    "Marica Branchesi",
    "Enzo Brocato",
    "Nelson Padilla",
    "Nicolás A. Pereyra",
    "Soma Mukherjee",
    "Matthew Benacquista",
    "Joey Key"
  ],
  "comment": "ApJ Letters, in press",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO",
    "astro-ph.IM"
  ],
  "abstract": "We present the results of the optical follow-up conducted by the TOROS collaboration of the first gravitational-wave event GW150914. We conducted unfiltered CCD observations (0.35-1 micron) with the 1.5-m telescope at Bosque Alegre starting ~2.5 days after the alarm. Given our limited field of view (~100 square arcmin), we targeted 14 nearby galaxies that were observable from the site and were located within the area of higher localization probability. We analyzed the observations using two independent implementations of difference-imaging algorithms, followed by a Random-Forest-based algorithm to discriminate between real and bogus transients. We did not find any bona fide transient event in the surveyed area down to a 5-sigma limiting magnitude of r=21.7 mag (AB). Our result is consistent with the LIGO detection of a binary black hole merger, for which no electromagnetic counterparts are expected, and with the expected rates of other astrophysical transients.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-07-26T19:22:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "electromagnetic counterpart",
      "toros collaboration",
      "first search",
      "first gravitational-wave event gw150914",
      "binary black hole merger"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}