TITLE: GCN GRB OBSERVATION REPORT NUMBER: 560 SUBJECT: GRB000210, Radio Observations DATE: 00/02/16 00:52:49 GMT FROM: Dale A. Frail at NRAO D. McConnell, R. Subrahmanyan, M.H. Wieringa, R.M. Wark (ATNF), D. A. Frail (NRAO), E. Berger and S. R. Kulkarni (Caltech) report: "We obtained a 8.2 hour integration with the Australia Telescope Compact Array (ATCA) on February 12.31 UT. In addition, shorter integrations were obtained at 8.46 GHz with the Very Large Array on February 10.99, Feb 14.90, Feb 15.03 UT. Both the ATCA and VLA imaged a field that fully covers the 50-arcsecond error circle of the fading NFI X-ray source, as reported by Costa et al. (GCN 553). There are no radio sources in the NFI above a 4-sigma level on any of the four days. The rms noise levels are 65 microJy (Feb. 10.99), 55 microJy (Feb. 12.31), 35 microJy (Feb. 14.90), and 38 microJy (Feb. 15.03). Adding together the data taken on February 14 and 15, we obtain an upper limit of 55 microJy (2-sigma) for the flux density of any radio afterglow at the position of the Chandra X-ray source (Garcia, Garmire amd Piro GCN 548)." This message may be cited.