{
  "bibcode": "2012GCN.13605....1K",
  "body": "Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),\nBoer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:\n\nWe imaged the field of GRB 120807 detected by SWIFT\n(trigger 530267) with the TAROT robotic telescope (D=25cm)\nlocated at the European Southern Observatory,\nLa Silla observatory, Chile.\n\nThe observations started 31.5s after the GRB trigger\n(15.2s after the notice). The elevation of the field decreased from\n8 degrees above horizon and weather conditions\nwere poor (due to the low elevation).\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 in the enhanced Swift-XRT position\n(Evans et al. GCNC 13603) with a limiting magnitude of:\nt0+31.5s to t0+91.5s : R > 15.5\n\nFurther images does not show OT anymore at about the\nsame limiting magnitude until 1500 seconds after the\ntrigger.\n\nMagnitudes were estimated with the nearby USNO-B1 stars\nand are not corrected for galactic dust extinction.\n\nN.B. Galactic coordinates are lon=333.3260 lat= +3.6420\nand the galactic extinction in R band is about 4 magnitudes\nestimated from D. Schlegel et al. 1998ApJ...500..525S.\n\nThis message may be cited.",
  "circularId": 13605,
  "createdOn": 1344350344000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 120807A: TAROT La Silla observatory optical observations",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 120807A"
}