{
  "bibcode": "2017GCN.21333....1V",
  "body": "A. Volnova (IKI),   A. Pozanenko (IKI),  A. Mokhnatkin (KIAM),  R. \nInasaridze (AbAO), E. Mazaeva (IKI), V. Agletdinov (KIAM),   V. Ayvazian \n(AbAO),  O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO),    I. Molotov (KIAM) \nreport on behalf of  larger GRB follow-up collaboration:\n\nWe observed the field of the Swift GRB 170711A (D'Elia  et al. GCN 21321) \nwith K-800 (0.8m) telescope  of  ISON/Terskol observatory starting on July, \n12 (UT) 00:00:39 and  AS-32 telescope of AbAO starting  on July, 11 (UT) \n23:58:46, i.e. about 1.6 hours after GRB trigger.  We obtained\nseveral unfiltered images. We do not detect any source in stacked images \nwithin the enhanced XRT position (Beardmore  et al. GCN 21323).\nPreliminary  photometry of the field is following\n\nDate       UT start  t-T0                 Filter   Exp.      OT     Err.  UL \nTelescope\n                      (mid, days)                         (s)\n\n2017-07-11   23:58:46 0.07894 CR      11*60 n/d n/d  17.0     AS-32\n2017-07-12   00:00:39 0.07658 CR      45*25 n/d n/d  19.1     K-800\n\nPhotometry is based on nearby stars of USNO-B1.0\nUSNO-B1.0_id   R2\n1378-0084355   14.59\n\n1378-0084262   15.13\n\n1378-0084218   14.70\n\nWe detect the object in  coordinates (J2000)  03 03 11.46  +47 50 56.1  (+/- \n0.5 arcsec) which is 7.7 arcsec apart from a center of the enhanced XRT \nposition. The object is clearly detected in the stacked image of K-800  and \nmarginally seen at  the same position with AS-32 stacked image. The \nbrightness of the object is 18.56 +/- 0.25 based on the reference stars \nlisted above. The object is absent in the  USNO-B1.0. At present, it is not \nclear whether this object has any relation to the GRB 170711A.",
  "circularId": 21333,
  "createdOn": 1499969595000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 170711A: ISON/Terskol and AbAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 170711A"
}