{
  "bibcode": "2006GCN..4483....1K",
  "body": "Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:\n\nWe imaged the field of GRB 060511 detected by SWIFT\n(trigger 176818) with the TAROT robotic telescope (D=25cm)\nlocated at the Calern observatory, France.\n\nFirst image was acquired 20s after the GCN trigger\n(7s after the notice). The field elevation increased\nfrom 23 degrees above horizon and weather conditions\nwere good. Moon was just rising (23 deg from the field)\nat the begining of observations. Due to a technical\nproblem, there was no image between 261 and 510s\nafter the trigger.\n\nWe detected no new source comparing our individual\nunfiltered images with the USNO-B1 catalog within\nthe error circle at the XRT position (Goad et al.\nGCNC 4481).\n\n From individual frames we give early limits:\n\nDay : 2006-01-11\nUT-start      UT-end      (sec since GRB)  Exp(s)  R-mag\n04:23:25.7  - 04:24.25.7    20 -   80        60   >16.2 (one frame trailed)\n04:24:32.4  - 04:25.02.4    86 -  116        30   >17.0 (one frame)\n04:25:08.7  - 04:25.38.7   122 -  152        30   >17.0 (one frame)\n04:31:36.2  - 04:33:06.2   510 -  600        90   >17.7 (one frame)\n\nTo increase the signal to noise, we co-added series frames.\nThe source at the XRT position (Goad et al. GCNC 4481) is\nmarginaly detected on the first co-addition:\n\nDay : 2006-01-11\nUT-start      UT-end      (sec since GRB)  R-mag\n04:24:32   - 04:27.27      86 -   261      ~18.3 (sum of 5 frames of 30s)\n04:31:36   - 04:40.13     510 -  1027      >18.7 (sum of 6 frames of 90s)\n\nMagnitudes were estimated with the nearby USNO-B1 stars.\n\nThis message may be cited.",
  "circularId": 4483,
  "createdOn": 1136994248000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 060111: TAROT optical observation",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 060111"
}