{
  "bibcode": "2011GCN.12740....1B",
  "body": "TITLE: T100 observations of GRB 111225A\n\nSonbas, E.(Adiyaman Univ.), Guver, T. (Sabanci Univ.), Gogus, E. (Sabanci\nUniv.),\nUysal, O. (Akdeniz Univ.), Sahin T. (Akdeniz Univ.), Eker, Z. (TUG), T.\nOzisik (TUG) on behalf of a larger collaboration.\n\n\nWe observed the field of GRB 111225A (Siegel et al., GCN #12720) with the\n1.0 meter T100 telescope (TUBITAK National\nObservatory, Antalya - Turkey), starting on December 25, 21:14 UT (~ 17\nhours after the trigger). We obtained\n3 x 60 s + 2 x 300 s exposures with R and B filters under moderate weather\nconditions (seeing 1.8\").\n\nWe do not detect an optical afterglow at the enhanced XRT error circle\nreported by Evans et al., GCN #12724\nin the combined R and B band images. We determine the following 3-sigma\nupper limits (calibrated to R2 and B2 mag. of USNO-B1)\nin the two bands:\n\n   t - t0        Exposure (s)          Filter              mag.\n~17.4 h           780                    R                 > 22.5\n~17.5 h           780                    B                 > 21.9\n\nWe are grateful to the TUBITAK National Observatory staff for promptly\nscheduling the observations and their\ntechnical support.",
  "circularId": 12740,
  "createdOn": 1325096816000,
  "email": "edasonbas@gmail.com",
  "subject": "GRB 111225A, optical observations",
  "submitter": "Eda Sonbas at NASA/GSFC  <edasonbas@gmail.com>",
  "eventId": "GRB 111225A"
}