TITLE: GCN CIRCULAR NUMBER: 19309 SUBJECT: GRB 160410A: TLS Tautenburg observations DATE: 16/04/12 21:16:50 GMT FROM: Sebastian Schmidl at TLS Tautenburg I. Juvan (IWF Graz), M. Bluemcke, D. Baak (University of Jena), S. Kunz, S. Schmidl, S. Klose, D. A. Kann, A. Nicuesa Guelbenzu, and F. Ludwig (TLS Tautenburg) report: We observed the field of GRB 160410A (Gibson et al., GCN 19271) with the Tautenburg 1.34-m Schmidt telescope at a mid-time of about 14.6 hrs after the GRB trigger, at a mean airmass of 1.5. We obtained 4 x 300s and 1 x 600s exposures in the Ic band. We do not detect the optical afterglow reported by Gibson et al. (GCN 19271), Yates et al. (GCN 19272), Selsing et al. (GCN 19274), Trotter et al. (GCN 19277), Wang et al. (GCN 19280) and Klotz et al (GCN 19287). We estimate a preliminary upper limit of Ic > 21.1 mag (AB magnitude system), calibrated against SDSS field stars. These observations were performed as part of the Tautenburg Observing School at the Thueringer Landessternwarte.