{
  "bibcode": "2014GCN.16780....1P",
  "body": "A. Pozanenko (IKI), I. Rewa, W. Mundrzyjewski, A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI),  report on behalf of larger GRB follow-up collaboration:\n\nWe observed the field of the Swift GRB 140818B  (Vargas et al., GCN 16709)with Zeiss-1000 (East) telescope of Tien Shan Astronomical Observatory starting on Aug. 19, (UT) 17:05. We took several images in R-filter.  Within enhanced XRT error circle  (Beardmore et al., GCN 16712) we do not detect the afterlow (Aceituno et al., GCN 16711; Knust et al., GCN 16713). The source mentioned by Knust et al. (GCN 16713) is clearly visible in a stacked image in coordinates (J2000) 18:04:32.76 -01:23:08.9 (uncertainty  is 0.2 arcsec in both coordinates)  and has brightness of R=22.1+/-0.1.\n\nDetails of a photometry of the stacked image are following\n\nDate       UT start  t-T0,d  Exp,s   Filter Up_Lim (3 sigma)\n                     (mid)\n\n2014-08-19 16:11:12  0.9317  20*600  R      22.9\n\n\nThe photometry is based on nearby USNO-B1.0 stars, R2 magnitudes.",
  "circularId": 16780,
  "createdOn": 1409897780000,
  "email": "alex@grb.rssi.ru",
  "subject": "GRB 140818B: TShAO optical upper limit",
  "submitter": "Alexei Pozanenko at IKI  <alex@grb.rssi.ru>",
  "eventId": "GRB 140818B"
}