TITLE: GCN CIRCULAR NUMBER: 699 SUBJECT: Optical Follow-up of GRB000529 Error Box DATE: 00/06/13 15:41:35 GMT FROM: Elena Pian at ITESRE-CNR,Bologna E. Palazzi, N. Masetti, E. Pian, F. Frontera (ITESRE, CNR, Bologna), A.J. Castro-Tirado (LAEFF, IAA), J. Hjorth (Univ. of Copenhagen), E. Rol, E.P.J. van den Heuvel (Univ. of Amsterdam), J. Greiner (AIP), O. Marco, J. Brewer and O. Hainaut (ESO), J.A.R. Caldwell (SAAO, observing on behalf of the PLANET collaboration), N. Suntzeff (CTIO), and M. Feroci (IAS, CNR, Rome), on behalf of a larger collaboration, report: "Optical R-band images of the X-ray afterglow error box (GCNs #684, #685) of GRB000529 (GCN #676) were acquired at three different epochs with four telescopes as reported in the following table: (UT) Telescope Texp(sec) Seeing(") R_lim(3-sigma) 2000 May 31.15 SAAO 1m 3000 1.4 22.7 May 31.44 CTIO 4m 900 1.0 24.0 May 31.44 ESO 2.2m 600 1.0 22.7 Jun 3.42 ESO NTT 100 1.4 22.3 Photometric calibration was performed using standard stars in the Landolt T Phe sequence (Landolt 1992, AJ 104, 340). Comparison of the images with the DSS-II red survey does not reveal any new object above the DSS limit (R~21.5). Unfortunately not all the images did cover the whole error box. The comparison among the overlapping regions of the acquired frames at the different epochs does not reveal any object with significant brightness variation down to a 3-sigma limiting magnitude of R ~22.3". This message can be cited.