{
  "bibcode": "2012GCN.13253....1X",
  "body": "L. P. Xin, J. Y. Wei, Y. L. Qiu, J. Wang,  J. S. Deng, \nC. Wu,  X. H. Han on behalf of EAFON report:\n \nWe began to observe GRB 120422A  (Troja et al., GCN 13243)\nwith Xinglong TNT telescope in R-band at 11:37:41(UT),   \n4.45 hours after the burst under the bad weather condition. \nThe optical counterpart  ( Cucchiara et al. GCN 13245;  \nKuin et al. GCN 13248; Klotz et al. GCN 13250; Schulze et al. GCN 13252)  \nwas not detected in our combined image.\nThe upper limit was estimated about 19.5 mag in R band \nat the mean time of 5.15 hours after \nthe burst, calibrated against the USNO B1.0 R2mag.\n\nThis message may be cited.\n \nFor more information about Xinglong GRBs Follow-up\nobservations, please visit the website:\nhttp://www.xinglong-naoc.org:8080/grb/index.html\n \nWe thank Liang Ma for performing these observations.",
  "circularId": 13253,
  "createdOn": 1335148699000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB 120422A: Xinglong TNT optical upper limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 120422A"
}