{
  "bibcode": "2011GCN.12011....1K",
  "body": "Klotz A. (CESR-OMP), Gendre B. (ASDC),\nBoer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:\n\nWe imaged the field of GRB 110503A detected by SWIFT\n(trigger 451901) with the TAROT robotic telescope (D=25cm)\nlocated at the Calern observatory, France.\n\nThe observations started 1.9h after the GRB trigger\n(trigger occured during daytime). The elevation of\nthe field decreased from 69 degrees above horizon\nand weather conditions were good.\n\nWe detect the candidate couterpart mentioned by\nStamatikos et al. 2011 (GCNC 11991) on co-added\nseries of exposures. We used the reference star\nUSNO B1.0 1421-0227752 (08:51:10.01 +52:11:04.75\nJ2000) described by Kann et al. 2011 (GCNC 11996)\nassuming  R=16.819 (Updike et al. GCN 12001).\n\nstart   stop   R\n1.96h - 2.65h  18.42 +/- 0.15\n2.71h - 3.99h  19.11 +/- 0.10\n4.04h - 5.33h  19.51 +/- 0.12\n5.38h - 7.43h  19.93 +/- 0.15\n\nMagnitudes were estimated with the nearby USNO-B1 stars\nand are not corrected for galactic dust extinction.\n\nFrom 1.96h to 7.43h, the decay slope is alpha = 1.1.",
  "circularId": 12011,
  "createdOn": 1304700978000,
  "email": "Alain.Klotz@free.fr",
  "subject": "GRB 110503A: TAROT Calern observatory optical observations",
  "submitter": "Alain Klotz at CESR-CNRS  <Alain.Klotz@free.fr>",
  "eventId": "GRB 110503A"
}