{
  "bibcode": "2007GCN..6563....1K",
  "body": "Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:\n\nWe imaged the field of GRB 070621 detected by SWIFT\n(trigger 282808) with the TAROT robotic telescope (D=25cm)\nlocated at the Calern observatory, France.\n\nThe observations started 23.5s after the GRB trigger\n(6.4s after the notice). The elevation of the field increased from\nfrom 3 degrees above horizon and weather conditions\nwere poor.\n\nThe date of trigger : t0 = 2007-06-21T23:17:39.840\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 any OT at the XRT location\n(Sbarufatti et al. GCNC 6560) with a limiting magnitude of:\nt0+23.5s to t0+83.5s : R > 14.9\n\nThe second image is 30.0s exposure in tracking mode:\nt0+90.3s to t0+120.3s : R > 15.4\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": 6563,
  "createdOn": 1182475779000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 070621: TAROT Calern observatory optical observations",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 070621"
}