TITLE: GCN GRB OBSERVATION REPORT NUMBER: 783 SUBJECT: GRB000210, Optical observations DATE: 00/09/02 13:02:05 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel (DSRI, Copenhagen), J. Hjorth, B. L. Jensen (U. of Copenhagen), J. P. U. Fynbo, A. O. Jaunsen (ESO), M. I. Andersen (U. of Oulu), S. Holland (U. of Aarhus), and N. Lund (DSRI, Copenhagen) report: "We have carried out optical observations of the corrected Chandra X-ray position of GRB 000210 (Garcia et al., GCN #548) with the 1.54-m Danish Telescope at La Silla, as follows: Date (Aug. 2000 UT) Filter Exp.(s) Seeing(") ---------------------------------------------------- 22.293 - 22.411 R 7x900 2.2 23.226 - 23.290 R 5x900 2.3 24.235 - 24.303 R 4x900 3.0 26.291 - 26.430 V 9x900 1.5 27.213 - 27.236 I 2x900 1.4 28.211 - 28.241 I 2x1200 1.4 29.207 - 29.300 I 7x1200 1.1 30.223 - 30.242 I 1200 1.1 31.213 - 31.245 B 2x1200 1.5 ---------------------------------------------------- The optical source coincident with the Chandra position (Gorosabel et al., GCN #545) is clearly detected in the co-added R, V and I-band images. Astrometry based on the USNO-A2.0 catalogue yields for the object RA(J2000) = 01h 59m 15.60s Dec(J2000) = -40d 39' 32.8" with an uncertainty of +/- 1". The position is consistent with the two updated Chandra positions derived by Garmire et al. (GCN #782). A comparison of the co-added R-band image with the R-band image taken on Feb 11.03 - 11.08 2000 UT (GCN #545) reveals a magnitude variation of 0.03 +/- 0.30 mag. Therefore, the object remains constant in brightness within the photometric errors. We derive a preliminary magnitude of R = 23.5 +/- 0.2 for the object."