TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3243 SUBJECT: GRB 050412: Optical observations DATE: 05/04/12 12:35:02 GMT FROM: Brian Lindgren Jensen at U.of Copenhagen GRB 050412: Optical observations Brian L. Jensen (Niels Bohr Institute), Javier Gorosabel (IAA-CSIC (Granada)), Peter Laursen, Pall Jakobsson, Darach Watson, Johan P. U. Fynbo, Jens Hjorth (Niels Bohr Institute) report: "Using DFOSC on the Danish 1.5m Telescope on La Silla we have obtained 2550s R-band imaging of the BAT error circle for GRB 050412 (GCN #3237) starting at 1.2 hr after the GRB trigger. In the XRT error-circle (GCN #3241) we detect a single source. The estimated magnitude of this source at t+1.5h is R ~ 22." [GCN_OPS_NOTE(12apr05): The affiliations were fixed up.]