{
  "bibcode": "2017GCN.21635....1P",
  "body": "A. Pozanenko (IKI), A. Volnova (IKI), E. Mazaeva (IKI), P. Minaev (IKI), \nM. Krugov (AFIF) report on behalf of IKI-GW follow-up collaboration:\n\nWe observed  the possible counterpart SSS17a/DLT17ck (Coulter et al. \nGCN 21529;  Yang et al., GCN 21531) of LIGO/Virgo trigger G298048 (LVC \nGCNs 21509, 21513)  with RC-1000 telescope of CHILESCOPE observatory. \nThe observations carried out in clear filter in two epochs, on Aug. 19 \nand Aug.20.\n\nPhotometry of the transient SSS17a/DLT17ck is following\n\nDate       UT start  Filter    OT   Err UpLim (3 sigma)\n\n\n2017-08-19 23:30:33   CR       16.7 0.2 21.9\n2017-08-20 23:21:09   CR       18.5 0.2 22.0\n\nThe photometry is based on several nearby USNO-B1.0 stars (R2). The \nphotometry  is still preliminary and required  careful estimation of \nNGC4339 influence. Nevertheless it is evident the source is fading \nsignificantly which is confirmed by many observations (e.g. Im et al., \nGCN 21632 and references in the GCN 21632).\n\nWe are grateful for the team of remote controlled CHILESCOPE observatory \n(www.chilescope.com) for observations.",
  "circularId": 21635,
  "createdOn": 1503331913000,
  "email": "grbgw.iki@gmail.com",
  "subject": "LIGO/Virgo G298048: observations of optical counterpart candidate with CHILESCOPE observatory",
  "submitter": "Alexei Pozanenko at IKI,Moscow  <grbgw.iki@gmail.com>",
  "eventId": "LIGO/Virgo G298048"
}