{
  "bibcode": "2014GCN.16810....1U",
  "body": "J. Ugarte (UPV-EHU), S. Perez-Hoyos (UPV-EHU), A. Sanchez-Lavega\n(UPV-EHU), R. Hueso (UPV-EHU), J. Gorosabel (IAA-CSIC/UPV-EHU) report on\nbehalf of the BEGIRA project:\n\nWe observed the GRB 140907A (GCN 16788) optical afterglow (GCN 16789, GCN\n16791, GCN 16792, GCN 16793, GCN 16797, GCN 16800, GCN 16802, GCN 16803,\nGCN 16804, GCN 16806, GCN 16809) with the 1.23m CAHA telescope. The\nobservations were carried out in the R and I-bands on Sep 8.96168-9.21435\nUT (30.96-37.05 hours post GRB). The optical afterglow is clearly detected\nwith a magnitude I(Vega)=21.4, calibrated against the USNO B1.0 catalog.",
  "circularId": 16810,
  "createdOn": 1410309157000,
  "email": "jgu@iaa.es",
  "subject": "GRB 140907A: 1.23m CAHA optical observations",
  "submitter": "Javier Gorosabel at IAA-CSIC  <jgu@iaa.es>",
  "eventId": "GRB 140907A"
}