{
  "bibcode": "2013GCN.14144....1X",
  "body": "L.P. Xin (NAOC), D. Xu (DARK/NBI), Z.Y. Wu, J.Y. Wei, Y.L. Qiu, T.M.\nZhang, J. Wang, J.S. Deng, C. Wu, X.H. Han (NAOC) report on behalf of\na larger collaboration:\n\nWe began to observe the field of GRB 130122A (Lien et.al. GCN 14140)\nusing the Xinglong 2.16m telescope located in Heibei Province, China\nat 18:14:12 UT on 2013-01-23. We obtained 5x300s R-band images in a\npoor seeing, with a median time of 19.7 hr after the BAT trigger.\n\nThe afterglow is not detected in the stacked image, down to a 3sigma\nlimit of R~20.2 mag, calibrated with nearby USNO B1 stars.\n\nThis message may be cited.\n\nFor more information about Xinglong GRBs Follow-up observations,\nplease visit the website:\nhttp://www.xinglong-naoc.org/grb/",
  "circularId": 14144,
  "createdOn": 1358970621000,
  "email": "dong.dark@gmail.com",
  "subject": "GRB 130122A: Xinglong optical upper limit",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>",
  "eventId": "GRB 130122A"
}