TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2263 SUBJECT: GRB 030519B: optical observations. DATE: 03/06/01 23:35:30 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel (IAA-CSIC/STScI), A. Levan (U. Leicester/STScI), A. de Ugarte Postigo (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), A. Fruchter (STScI), S. Guziy (IAA-CSIC), J.M. Castro Cerón (STScI), A. Guijarro (CAHA), A. Aguirre (CAHA), M. Alises (CAHA) report: "We have carried out observations of the central part (coverage ~75%) of the GRB 030519B (GCN 2235) error box, in four optical bands, with the 2.2m (+BUSCA) telescope at the Observatorio de Calar Alto. Three of these four bands are non standard and calibration is still pending. The fourth one corresponds to Ic, with photometry as follows: --------------------------------------------- Date Texp Seeing Lim. Mag. (May 2003 UT) (s) (") (3 sigma) --------------------------------------------- 21.03872--21.06376 3x600 2.0 23.3 21.99519--22.07959 7x600 2.2 23.5 22.98905--23.07625 5x900 3.1 23.3 24.00387--24.03936 3x900 2.3 23.3 --------------------------------------------- PSF matched subtraction did not reveal any reliable afterglow candidate brighter than Ic ~ 23, implying that this burst likely belongs to the dark GRB class." This message may be cited.