TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2242 SUBJECT: GRB 030329 Optical Observations DATE: 03/05/22 14:45:48 GMT FROM: Javier Gorosabel at LAEFF-INTA, Madrid J. Gorosabel (IAA-CSIC/STScI), A. de Ugarte Postigo (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), A. Fruchter (STScI), A. Levan (U. Leicester/STScI), S. Guziy (IAA-CSIC), J.M. Castro CerĂ³n (STScI), A. Guijarro (CAHA), A. Aguirre (CAHA), report: "We have imaged the field of the GRB 030329 (GCN 1997) in four optical colours with the 2.2 m (+BUSCA) telescope at the Observatorio de Calar Alto on 20.9148-20.9670 UT May 2003. Aperture photometry of the counterpart yielded Ic = 20.92 +/- 0.07. The zero point is based on the star located at R.A.(J2000) = 10:44:42, Dec(J2000) = +21:32:31.6 with I = 15.432 (GCN 2082). Further observations are planned." This message may be cited.