{
  "bibcode": "2015GCN.17969....1X",
  "body": "D. Xu (NAOC/CAS), J. Telting (NOT), J. P. U. Fynbo (DARK/NBI) report on behalf of a larger collaboration:\n\nWe observed the field of GRB 150626B (McCauley et al., GCN 17966) using the 2.56m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. We obtained 2x150s SDSS r-band and 6x180s SDSS z-band frames, with their median time of 1.379 hr and 1.936 hr after the burst, respectively.\n\nNo optical source is detected at the (enhanced) XRT position (McCauley et al., GCN 17966; Goad et al., GCN 17968) in our stacked r- and z-band images, down to the limiting magnitudes of r~22.3 mag and z~21.6 mag, respectively.",
  "circularId": 17969,
  "createdOn": 1435365775000,
  "email": "dxu@nao.cas.cn",
  "subject": "GRB 150626B: NOT optical upper limits",
  "submitter": "Dong Xu at NAOC/CAS  <dxu@nao.cas.cn>",
  "eventId": "GRB 150626B"
}