{
  "bibcode": "2013GCN.14861....1V",
  "body": "A. Volnova (IKI), V. Linkov (ISON), M.Suvorov (ISON), V. Nevskiy (ISON), \nD. Ivanov (ISON),  I. Molotov (KIAM), A. Pozanenko (IKI),  report on \nbehalf of larger collaboration:\n\nWe observed the field of  GRB 130608A (Krimm  et al., GCN 14827) with\nSANTEL-400AN (0.4-m f/3)  telescope of ISON-Kislovodsk observatory.\nObservations started on  Jun. 09 (UT) 00:01:42.   We obtained  several\nunfiltered images  of 60 s exposure. We do not detect any source within \nenhanced XRT error circle (Beardmore et al., GCN 14832). Preliminary \nphotometry of combined image is based on USNO-B1.0 (R2) nearby  stars:\n\nT_start,             T0+,      Exp,   Filter,  UL (3 sigma)\n(UT)                 mid (d)   (s)\n\n2013-06-09T00:01:42  0.04170   960    none     >18.1",
  "circularId": 14861,
  "createdOn": 1370894503000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 130608A: ISON-Kislovodsk optical upper limit",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 130608A"
}