{
  "bibcode": "2010GCN.10657....1G",
  "body": "J. Gorosabel (IAA-CSIC), C. Zurita (IAC),  A. de Ugarte Postigo (INAF- \nOAB),  on behalf of a larger collaboration report:\n\n\"We have observed the field of Swift trigger 420256 (Hoversten et al.,  \nGCNC 10654) with the 80-cm IAC80 telescope on the observatory of  \nTeide, Tenerife, Spain. The observations were conducted in the R-band  \non April 23.1453-23.1906 UT (0.75-1.84 hours post burst) with a total  \nexposure  time of 3000s.\n\nVisual comparison to the DSS reveals no new sources in the co-added  \nimage within the Swift/BAT error circle brighter than R=19 (USNO-B1.0  \ncalibration).\"",
  "circularId": 10657,
  "createdOn": 1272007325000,
  "email": "jgu@iaa.es",
  "subject": "Swift Trigger 420256: IAC80 R-band observations",
  "submitter": "Javier Gorosabel at IAA-CSIC  <jgu@iaa.es>"
}