TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1001 SUBJECT: GRB010220 optical obsercations DATE: 01/03/02 08:30:50 GMT FROM: Stefano Covino at Brera Astronomical Observatory D. Fugazza (Brera Astronomical Observatory), A. Moitinho, H. Plana, S. Monrroy (Observatorio Astronomico Nacional, Mexico), S. Covino, G. Ghisellini (Brera Astronomical Observatory) We have observed the error box of GRB010220 (GCN 953) with the 0.84m telescope of the Observatorio Astronomico Nacional at San Pedro Martir (Mexico) equipped with the SITE CCD on 22 Feb at 3:00 UT (28.15 hours after the burst). We obtained three 120sec exposures in the R band and 8 120sec exposures in the B band. No obvious counterpart has been detected and no sources lay at the position of the radio source reported by Berger et al. (GCN 958). The position however is very close to a bright star that may hidden any faint object. By unsaturated stars common to the USNO-A2.0 we estimate the 3-sigma B and R upper limits at ~23. This message may be cited