{
  "bibcode": "2017GCN.21459....1C",
  "body": "A. J. Castro-Tirado (IAA-CSIC and ISA-UMA), C. P��rez del Pulgar and R. \nMart��n M��rquez (ISA-UMA), A. Castell��n (UMA), M. Jel��nek (ASU-CAS), R. \nCunniffe, Y. Hu and A. Gonz��lez-Rodr��guez (IAA-CSIC), P. Peseev, G. \nG��mez and A. Alonso (GRANTECAN),  on behalf of a larger collaboration \nreport:\n\nIn response to the LIGO/Virgo GW Binary Merger Candidate G296853 on Aug \n9, 08:28 UT (GCNC 21431), a mosaic of unfiltered images covering 80% of \nthe GraceDB skymap (above -45 in Dec) was taken starting on Aug 10, \n01:30 UT (i.e. 17 hr later) with the wide-field imager at the BOOTES-1 \nstation located at the ESAt/INTA-CEDEA in Mazag��n (Huelva, Spain), down \nto a R = 12 limiting magnitude. In addition to this, data for several \nselected fields within the skymap center were gathered the same night \nwith the 10.4m GTC telescope (+OSIRIS spectrograph) in riz filters down \nto R = 21.5, with the images quality being affected by the nearby full \nmoon and the poor transparency due to the dust from Sahara. A more \ndetailed analysis of the data is in progress.",
  "circularId": 21459,
  "createdOn": 1502470935000,
  "email": "ajct@iaa.es",
  "subject": "LIGO/Virgo G296853: BOOTES-1 and GTC optical observations",
  "submitter": "Alberto J. Castro-Tirado at IAA-CSIC  <ajct@iaa.es>",
  "eventId": "LIGO/Virgo G296853"
}