{
  "bibcode": "2005GCN..3384....1D",
  "body": "A. de Ugarte Postigo, A.J. Castro-Tirado (IAA-CSIC Granada),\nA. Eigenbrod (EPF de Lausanne), M. Jelinek, J. Gorosabel\nand S. Guziy (IAA-CSIC Granada),\n                     \nreport:\n                     \n\"Following the detection by Swift-BAT of the short gamma-ray burst \nGRB 050509b (Hurkett et al. GCN 3381), we have obtained \ntwo R-band images (300s exposure time each) with the 1.2m Mercator \ntelescope at Roque de los Muchachos Observatory in La Palma, \nstarting at 04:36:02 UT (i.e. 35.88. min after the onset of \nthe burst). The location was observed under poor seeing conditions,\nat very high airmass. We do not identify any source within \nthe error box provided by Swift-XRT (Kennea et al. GCN 3383) down to \nmagnitude 21.\"\n\nThis message may be cited.",
  "circularId": 3384,
  "createdOn": 1115621092000,
  "email": "ajct@laeff.esa.es",
  "subject": "GRB 050509b: optical observations",
  "submitter": "Alberto Castro-Tirado at LAEFF-INTA  <ajct@laeff.esa.es>",
  "eventId": "GRB 050509B"
}