{
  "bibcode": "2005GCN..3015....1B",
  "body": "G.Bourban, C.Vuissoz, F.Carrier, G.Burki and L.Weber (Geneva \nObservatory, Switzerland) report:\n\n\nWe have carried out optical observations of the 12'x 12' field centered \non the error circle of HETE trigger #11568 (~93% of the whole \nuncertainty area provided by HETE/WXM) using the C2 CCD Camera mounted \non the Swiss 1.2-meter telescope located at the ESO La Silla Observatory \n(Chile). The observations began on 2005 Feb 09 at 03:57:30 UT (129s \nafter the alert sent by HETE team, i.e 2.43 h after the burst) and four \ndifferent sets of measurements were performed during the night at 03:57 \nUT, 04:57 UT, 06:07 UT and 07:12 UT (1.5 < Fz < 2.7). A total of 3 \nR-filtered images with exposure time of 180s as well as 8 R-filtered \n480s exposures were obtained under good wheather conditions.\n\nThe division of these images as well as their comparison with the \nUSNO-A2 catalog did not reveal any new or fainting source inside the \nfield of view of the C2 camera, down to a limiting magnitude of R < 20.5.\n\nThis message may be cited.",
  "circularId": 3015,
  "createdOn": 1107949482000,
  "email": "grb@obs.unige.ch",
  "subject": "GRB 050209 Optical observations",
  "submitter": "Gerald Bourban at Geneva Observatory  <grb@obs.unige.ch>",
  "eventId": "GRB 050209"
}