{
  "bibcode": "2013GCN.15326....1X",
  "body": "D. Xu (DARK/NBI), C.-M. Zhang, C. Cao, S.-M. Hu (SDU) report:\n\nWe observed the location of the candidate optical afterglow\n(iPTF13dsw; Kasliwal et al., GCN 15324) of the Fermi-GBM trigger\n403206457 with the 1m telescope located in Weihai, Shandong, China. We\nobtained 5x600s R-band frames at a mean time of 2013-10-12 18:01:29 UT\n(i.e., 24.23 hr after the Fermi-GBM trigger) under some clouds.\n\nNo optical source is detected at the iPTF location in the stacked\nimage down to a limiting magnitude of R > ~20.0 mag, calibrated with\nthe nearby SDSS field.",
  "circularId": 15326,
  "createdOn": 1381642967000,
  "email": "dong.dark@gmail.com",
  "subject": "Fermi403206457: Weihai optical upper limit",
  "submitter": "Dong Xu at DARK/NBI  <dong.dark@gmail.com>"
}