TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5501 SUBJECT: GRB060901: Optical observations DATE: 06/09/03 19:51:06 GMT FROM: Klaas Wiersema at GRACE/U of Amsterdam K. Wiersema (University of Amsterdam) and C.C. Thoene (DARK Cosmology Centre) report: Using DFOSC on the Danish 1.5m telescope at La Silla we obtained R band imaging of the error circle of Integral burst GRB060901. Observations consisted of a series of 5 min exposures, starting at 1 Sep 23:46 UT and lasted until 2 Sep 02:19 UT. A second epoch was taken from 03:59 UT to 04:25 UT. We performed PSF matched image subtraction (Alard 2000) on the dataset as the field is very crowded. We find no significantly varying source in or near the XRT error circle (Racusin, GCN5496). Our full stacked dataset reaches a limiting magnitude of R~23.9.