{
  "bibcode": "2010GCN.10656....1D",
  "body": "A. de Ugarte Postigo (INAF-OAB), J.Gorosabel (IAA-CSIC), A.J. Castro- \nTirado (IAA-CSIC), P. Kubanek (Univ. Valencia, IAA-CSIC), M. Jelinek  \n(IAA-CSIC) report on behalf of a larger collaboration:\n\n\"We have imaged the field of Swift trigger 420256 (Hoversten et al.,  \nGCNC 10654) using the 0.6m TELMA telescope (BOOTES-2). Observations  \nwere obtained through a clear filter and began at 2:46 UT (126s after  \nthe burst). In a 1724s exposure with mid time 03:13UT (1741s after the  \nbursts) we do not detect any new source within the BAT error box down  \nto a 3-sigma limiting magnitude of R~18, as compared to the USNO-B1.0.\"",
  "circularId": 10656,
  "createdOn": 1272006992000,
  "email": "jgu@iaa.es",
  "subject": "Swift Trigger 420256: BOOTES-2 observations",
  "submitter": "Javier Gorosabel at IAA-CSIC  <jgu@iaa.es>"
}