GCN Circular 1678
T. Giannini, B. Nisini, L.A. Antonelli, F. Fiore, and L. Stella (INAF-Oss. Astronomico Roma) report: "K band spectra of GRB021004 were obtained on October 05 2002 05:27 UT using ISAAC at VLT/UT1. The observations cover the spectral range 1.8-2.5 micron at a resolution of R=450. The total exposure time was of 3000 seconds. At the time of the observations the afterglow magnitude was K~16.5 (Di Paola et al. GCN #1616). A preliminary analysis of the spectra reveals no strong emission or absorption features in the range 2.1-2.4 micron, where the signal to noise is highest. In particular, no significant absorption or emission line is detected at 2.18-2.19 micron where the Halpha transition associated to the host galaxy (z=2.335 Moller et al. astro-ph 0210654) or to the strongest absorption system (z=2.328, Savaglio et al. GCN #1633) should lie. The 3 sigma limit to the redshifted Halpha absorption is of about 8 Angstrom." This message may be quoted.