{
  "bibcode": "2009GCN..9142....1X",
  "body": "L. P. Xin, X. F. Wang, W. K. Zheng, Y. L. Qiu, J. Y. Wei,\nJ. Wang, J. S. Deng, Y. Urata and J. Y. Hu\non behalf of EAFON report:\n\nWe have observed GRB 090417B (Sbarufatti et al., GCN 9135)\nwith Xinglong TNT telescope from  Apr.17,15:34:38(UT),\n14.5 min after the burst. The weather was cloudy.\nAfter combined  white and R band images, \nno new source was found in our combined images. \nThe 3 sigma upper limits derived from USNO-B1.0 R2 \nmagnitudes were shown as following:\n--------------------------------------------------------\nMeanTime exposure  Band   Mag    UpperLimit?   coadded?\n--------------------------------------------------------\n16.5min    8*40s   white  20.1       yes          yes\n1.63hr    29*300s   R     21.6       yes          yes\n-------------------------------------------------------\n\nWe also notice that in the location of XRT error circle,\na extended object was likely to be present,\nas found by Fynbo et al (GCN 9140).\nHowever, the S/N is very low that we could not make sure.\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/grb/",
  "circularId": 9142,
  "createdOn": 1240031036000,
  "email": "xlp@bao.ac.cn",
  "subject": "GRB090417B: Xinglong TNT optical upper limit",
  "submitter": "L.P. Xin at NAOC  <xlp@bao.ac.cn>",
  "eventId": "GRB 090417B"
}