{
  "bibcode": "2017GCN.21764....1D",
  "body": "D. Denisenko (Sternberg Astronomical Institute, Moscow State\nUniversity) reports:\n\nMAXI/GSC error box of GRB 170830A (T. Yoneyama et al., GCN 21761) was\nobserved remotely by iTelescope.Net T32 instrument (0.43-m f/6.8\nreflector + FLI Proline 16803 CCD) in Siding Spring, Australia, at\n08:55-08:58 UT on 2017 Aug. 30 (5.7 hours after the trigger time). The\ntelescope was centered at R.A. = 17 48 20, Decl. = -01 50 00 with a\n43'x43' field of view covering the entire rectangular error box by\nMAXI/GSC. Observations were performed at the zenith distance of 31\ndegree, only 18 deg from the waxing Moon (phase 0.60).\n\nVisual inspection of the combined image (3x60-sec unfiltered\nexposures) against 1991-06-15 DSS Red plate shows no optical transient\nto the 3-sigma upper limit of 18.5m (calibrated against USNO-B1.0 Red\nmagnitudes). In particular, there is no new object in the vicinity of\nthe unidentified ROSAT X-ray source 1RXS J174835.3-014843 which falls\ninside the gamma-ray burst error box.",
  "circularId": 21764,
  "createdOn": 1504086530000,
  "email": "d.v.denisenko@gmail.com",
  "subject": "GRB 170830A: iTelescope optical observations",
  "submitter": "Denis Denisenko at SAI MSU  <d.v.denisenko@gmail.com>",
  "eventId": "GRB 170830A"
}