{
  "bibcode": "2007GCN..6487....1K",
  "body": "Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:\n\nWe imaged the field of GRB 070411 detected by SWIFT\n(trigger 275087) with the TAROT robotic telescope (D=25cm)\nlocated at the Calern observatory, France.\nAnalysis of this burst is late due to a technichal\nproblem.\n\nThe observations started 45.6s after the GRB trigger\n(5.7s after the notice) when the burst was still active.\nThe elevation of the field decreased from\nfrom 33 degrees above horizon and weather conditions\nwere poor (cloudy).\n\nThe date of trigger : t0 = 2007-04-11T20:12:33.120\n\nThe first image is trailed with a duration of 60.0s\n(see the description in Klotz et al., 2006, A&A 451, L39).\nWe do not detect the UVOT candidate position (Moretti\net al., GCN 6267) with a limiting magnitude of:\nt0+45.6s to t0+105.6s : R > 14.6\n\nThe second image is 30.0s exposure in tracking mode:\nt0+112.6s to t0+142.6s : R > 15.5\n\nFurther images have no significant higher limiting\nmagnitude.\n\nMagnitudes were estimated with the nearby USNO-B1 stars\nand are not corrected for galactic dust extinction.\n\nThis message may be cited.",
  "circularId": 6487,
  "createdOn": 1181281821000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 070411: TAROT Calern observatory optical observations",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 070411"
}