{
  "bibcode": "2011GCN.12625....1X",
  "body": "D. Xu (WIS) reports on behalf of a larger collaboration:\n\nWe re-processed 1x600s R-band and 3x600s z-band images (Zhao et al.,\nGCN 12560), starting 1.960 hrs post-burst,  with calibration frames\navailable later on. The R-band non-detection remains unchanged.\n\nHowever, in the stacked z-band image an optical source was weakly\ndetected, with its position consistent with the NOT position (Andersen\net al., GCN 12563), the refined XRT position (Melandri et al., GCN\n12565), as well as the refined Chandra position (Berger et al., GCN\n12588), and to the magnitude of z=22.9+/-0.3, calibrated with nearby\nSDSS stars. The z-band afterglow faded and was not detected by\nfollowing GROND observation (Schmidl et al., GCN 12568).",
  "circularId": 12625,
  "createdOn": 1323262124000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 111117A: Refined GMG observation",
  "submitter": "Dong Xu at Weizmann Inst  <dong.dark@gmail.com>",
  "eventId": "GRB 111117A"
}