TITLE: GCN CIRCULAR NUMBER: 7241 SUBJECT: GRB 080129: Optical observations from OSN DATE: 08/01/30 20:18:53 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO, Santiago), D. Diaz Fraile, F. Aceituno, E. Rodríguez, A.J. Castro-Tirado, J. Gorosabel, M. Jelinek (IAA-CSIC, Granada) and A. Pozanenko (IKI, Moscow) report on behalf of a larger collaboration: We have observed GRB 080129 (Immler et al. GCN 7226) with the 1.5m OSN telescope at Sierra Nevada Observatory (Granda, Spain). The observations consist of a series of 625x19s exposures in I-band, and range from 29.8614 Jan 2008 to 30.0166 Jan 2008 UT (0.607-0.762 days after the burst). We do not detect any source in the individual frames down to an average limiting magnitude I < 20.3. However, the combined frame does show the source identified by Bloom et al. (GCN 7229) at I ~ 22.1. A finding chart can be seen at: http://www.iaa.es/~deugarte/GRBs/080129/080129_OSN_fc.jpg This message may be cited. [GCN OPS NOTE(31jan08): Per author's request, M. Jelinek was added to the author list.]