GCN Circular 607
The resolution in my previous email was wrong. The corrected version is given below. Feng, M., Wang, L., and Wheeler, J. C., University of Texas at Austin report: We obtained a low resolution (resolving power about 500) spectrum of GRB 000301c with the 2.7 meter telescope at McDonald Observatory on 2000 March 3.47. The total exposure time was 3900 seconds with wavelength coverage from 318 nm to 589 nm. The low S/N (about 2-4) spectrum can be fitted with a power law of spectral index beta = -1.1 witn no obvious breaks after correcting for interstellar extinction assuming R = 3.1, E(B-V) = 0.05 (cf GCN 585). The flux level is around 2.5E-17 ergs/cm2/sec/A. This puts any possible Lyman break at wavelengths shorter than 318 nm. The object is thus at a redshift lower than 2.5. This is consistent with the report by Smette et al. (GCN 603). The spectrum may reveal two absorption features at 336.0 nm and 352.2 nm. If identified with Lyman alpha, the redshifts of these features are 1.76 and 1.89. The data also show another absorption feature at 367.1 nm, but with even lower confidence level. This feature yields a redshift of 2.02 if identified with Lyman alpha. Another possible feature is an absorption at 405.8 nm which might be identified with C II 133.5 nm at a redshift of 2.04. This message may be cited.