GCN Circular 1980
P. Martini (OCIW), P. Garnavich (Notre Dame) and K.Z. Stanek (CfA) Spectra of the optical afterglow of GRB 030328 (Peterson & Price, GCN 1974) were obtained with the Magellan 6.5-m Clay telescope and LDSS2 imaging/spectrograph starting at March 29.19 (UT). The five spectra cover the wavelength range of 4000 to 9000 Ang. with a resolution of 13 Ang. FWHM. Preliminary reduction of the images reveals narrow absorption features which we identify with a single absorption system at z=1.52: observed (Ang) ID z 7069.6 MgII 2802.7 1.522 7049.2 MgII 2795.5 1.522 6554.6 FeII 2599.4 1.522 6005.7 FeII 2382.0 1.521 5987.6 FeII 2373.7 1.522 4207.9 AlII 1670.8 1.518 This suggests that the redshift of the GRB is at least z=1.52. This message may be cited.