TITLE: GCN CIRCULAR NUMBER: 8772 SUBJECT: GRB 090102 Observations from IAC80 DATE: 09/01/03 01:31:48 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO), L. Blanco (IAC) A.J. Castro-Tirado (IAA-CSIC), report on behalf of a larger collaboration: We have observed the field of GRB090102 (Mangano et al., GCN 8762) from the IAC80 telescope at Izaņa Observatory in Tenerife (Spain). A 6x300s combined exposure with mean epoch 2.92 Jan 2009 (19.2h after the burst) shows the afterglow (Klotz et al., GCN 8761) with R=22.6+/-0.3, as compared to stars of the UNSO-B1.0. This is consistent with the prediction of Afonso et al. (GCN 8771) for day 1.