{
  "bibcode": "2005GCN..3911....1K",
  "body": "Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:\n\nWe imaged the field of GRB 050904 detected by SWIFT\n(trigger 153514) with the TAROT robotic telescope (D=25cm)\nlocated at the Calern observatory, France.\n\nFirst image was acquired 86s after the GCN trigger.\nThe field had an elevation of 60 degrees above horizon\nand weather conditions were good.\n\nWe detected no new source comparing our unfiltered images\nwith the USNO-B catalog.\n\n From the first frame we give an early limit:\n\nDay : 2005-09-04\nUT-start      UT-end      (sec since GRB)  Exp(s)  R-mag\n01:53:10.33 - 01:54:08.33   86 -  101          15  >16.0\n\nWe co-added 13 first frames and no new source\nis detected:\n\nDay : 2005-09-04\nUT-start      UT-end      (sec since GRB)  Exp(s)  R-mag\n01:53:10.33 - 02:00:18.74   86 -  515         360  >18.5\n\nLimiting magnitude was estimated with the nearby USNO-B1 stars.\n\nThis message can be cited.",
  "circularId": 3911,
  "createdOn": 1125818603000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 050904: TAROT optical limits",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 050904"
}