{
  "bibcode": "2007GCN..6483....1R",
  "body": "V. Rumyantsev (CrAO),  V. Biryukov (CrAO, SAI MSU),  A. Pozanenko (IKI)\non behalf of larger GRB follow up collaboration report:\n\nWe observed error box of GRB070518 with 1-m Zeiss (Simeiz) telescopes\nof CrAO in R-band on May 18 between (UT)19:35 and 20:30. Due to\nblending of the nearby star (USNO-A2.0 R=3D18.7) and poor seeing (~4.5\")\nwe do not resolve clearly optical transient (Guidorzi et al., GCN\n6415) in a combined image. More sophisticated photometry estimation is\nunderway. A limiting magnitude of the combined image is based on USNO\nA2.0:\n\nMid time (UT),  Exposure,   R_Lim (3sigma),   Seeing\n\nMay 18.835      50x60       22.0              4.5\"\n\nThis message may be cited.\n\n[GCN OPS NOTE(02jun07): The binary attachment was removed as well as the\ndiagnostics from MIMEDefang reacting to that binary.]",
  "circularId": 6483,
  "createdOn": 1180801944000,
  "email": "rum@crao.crimea.ua",
  "subject": "GRB070518: optical observation",
  "submitter": "Vasilij Rumjantsev at CrAO  <rum@crao.crimea.ua>",
  "eventId": "GRB 070518"
}