{
  "bibcode": "2014GCN.16154....1X",
  "body": "D. Xu (DARK/NBI), X. Zhang, C.-H. Bai, A. Esamdin, L. Ma (XAO) report:\n\nWe observed the optical afterglow field of GRB 140423A (Sonbas et al.,\nGCN 16142; Elenin et al., GCN 16143; Kaur et al., GCN 16144;) using\nthe 1m telescope located at Nanshan, Xinjiang, China. Three R-band\nframes were obtained under rather bad weather. The afterglow has\ndecayed down to a limiting magnitude of m(R)>19.4 mag at a mean time\nof 8.216 hr post-burst, calibrated with nearby SDSS stars.",
  "circularId": 16154,
  "createdOn": 1398274012000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 140423A: Nanshan optical upper limit",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>",
  "eventId": "GRB 140423A"
}