TITLE: GCN GRB OBSERVATION REPORT NUMBER: 436 SUBJECT: GRB 991106, optical observations DATE: 99/11/07 02:17:06 GMT FROM: Alberto Castro-Tirado at Inst.de Astrofisica de Andaluciaajct@iaa.es GRB 991106, optical observations -------------------------------------- Alberto Castro-Tirado, LAEFF-INTA (Madrid) and IAA-CSIC (Granada) Javier Gorosabel, LAEFF-INTA (Madrid) and University of Amsterdam (UoA) Eloy Rodriguez and Justo Sanchez del Rio, IAA-CSIC Christian Vanderiest and Dominic Proust (Observatorio de Meudon, Paris) Marco Feroci, IAS (Frascati), on behalf of the BSAX team report: "We have obtained sixteen exposures of the BeppoSAX position of GRB 991106 (Gandolfi et al. GCN 435) with the 1.5-m telescope at the Observatorio de Sierra Nevada (IAA-CSIC) near Granada. The images were taken starting 9.1-hr after the event (Nov 6.83-6.97 UT) through R- and I-band filters. After a visual comparison with the Digital Sky Survey, no sources varying by more than 0.3 mag were seen to the DSS limit within the BSAX WFC error box." This report can be cited in other publications.