TITLE: GCN CIRCULAR NUMBER: 7478 SUBJECT: GRB 080320: optical limit from IAC80 DATE: 08/03/20 06:13:06 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada Martin Jelinek, Alberto J. Castro-Tirado (IAA-CSIC Granada), and Jorge Plá (IAC La Laguna), on behalf of a larger collaboration, report: "We observed the XRT localization of the GRB080320 (Grupe et al. GCN 7473) with the 0.8m IAC80 at Obs. del Teide in Tenerife, with exposure mean time 5:33UT (i.e. 1hour after the GRB). We do not detect any source within or near the XRT error box down to the limiting magnitude of R~20.0." this message may be cited