{
  "bibcode": "2006GCN..5501....1W",
  "body": "K. Wiersema (University of Amsterdam) and C.C. Thoene (DARK Cosmology\nCentre) report:\n\nUsing DFOSC on the Danish 1.5m telescope at La Silla we obtained R band\nimaging of the error circle of Integral burst GRB060901.\nObservations consisted of a series of 5 min exposures, starting at 1 Sep\n23:46 UT and lasted until 2 Sep 02:19 UT. A second epoch was taken\nfrom 03:59 UT to 04:25 UT.\nWe performed PSF matched image subtraction (Alard 2000) on the dataset as\nthe field is very crowded. We find no significantly varying source in or\nnear the XRT error circle (Racusin, GCN5496). Our full stacked dataset\nreaches a limiting magnitude of R~23.9.",
  "circularId": 5501,
  "createdOn": 1157313066000,
  "email": "kwrsema@science.uva.nl",
  "subject": "GRB060901: Optical observations",
  "submitter": "Klaas Wiersema at GRACE/U of Amsterdam  <kwrsema@science.uva.nl>",
  "eventId": "GRB 060901"
}