2003IAUC.8114....2C

R. Chornock, R. J. Foley, A. V. Filippenko, M. Papenkova, and D. Weisz, University of California, Berkeley, write: "Inspection of CCD spectra (range 310-1000 nm) of GRB 030329, obtained on Apr. 8 UT with the Shane 3-m telescope at Lick Observatory, confirms the emergence of broad bumps (especially at rest-frame 500 nm) characteristic of the peculiar type-Ic supernovae 1998bw and 2002ap at early times, as announced by Garnavich et al. on IAUC 8108. The association between core-collapse supernovae and at least some of the long-duration GRBs thus seems solid. We expect the supernova features to continue strengthening with time relative to the power- law continuum of the GRB afterglow."