{
  "bibcode": "2013GCN.15518....1X",
  "body": "D. Xu (DARK/NBI), J.-Z. Liu, G.-J. Feng, H.-B. Niu, C.-H. Bai, A.\nEsamdin, L. Ma (XAO) report:\n\nWe observed the field of GRB 131127A (Markwardt et al., GCN 15516)\nusing 1m telescope located on Mt. Nanshan, Xinjiang, China.\nObservations started at 11:45:12 UT on 2013-11-27 (i.e., 1.56 hr after\nthe BAT trigger) and a series of R-band frames were obtained.\n\nWithin the SPER XRT error circle (http://www.swift.ac.uk/sper/) of\nthis burst, no crediable optical source is detected down to a limiting\nmagnitude of R=20.5 mag, calibrated with nearby USNO B1 field.",
  "circularId": 15518,
  "createdOn": 1385555601000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 131127A: Nanshan optical upper limit",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>",
  "eventId": "GRB 131127A"
}