{
  "bibcode": "2011GCN.11928....1S",
  "body": "A. Sota, J. Gorosabel and M. Jelinek (IAA-CSIC), \nreport on behalf of a larger collaboration.\n\n\"We have observed the XRT error circle (Goad et al. GCNC\n11920) of GRB 110411A (Grupe et al. GCNC 11918) with the 1.5m\ntelescope of Observatorio de Sierra Nevada, Granada, Spain.\nThe observations were carried out on April 12.06606-12.12741\nUT (6.01-7.49 hours post trigger) in the R and I bands with an\nexposure time of 8x300s in each band. No object is detected\nwithin the XRT error circle down to R < 23.5 and I < 22.4,\ncalibrated against USNO B1.0\".",
  "circularId": 11928,
  "createdOn": 1302632794000,
  "email": "mates@iaa.es",
  "subject": "GRB 110411A: optical limits from OSN",
  "submitter": "Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates@iaa.es>",
  "eventId": "GRB 110411A"
}