Return to Home Page
TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2120 SUBJECT: GRB 030329: Supernova Confirmed DATE: 03/04/08 20:13:40 GMT FROM: Krzysztof Z. Stanek at CfA <kstanek@cfa.harvard.edu> T. Matheson (CfA), P. Garnavich (Notre Dame), E. W. Olszewski (Steward), P. Harding (Case Western), D. Eisenstein (Arizona), B. Pindor (Princeton), N. Hathi, R. Jansen, R. Windhorst, L. Echevarria (ASU), J. Lee (Arizona), W. Brown, N. Caldwell, P. Berlind, M. Calkins and K. Z. Stanek (CfA) report: Additional spectra of the afterglow of GRB 030329 (Peterson & Price, GCN 1985; Torii: GCN 1986) were obtained with the 6.5-m MMT on Apr. 8.13 UT. The spectral features discovered by Matheson et al. (GCN 2107) and confirmed by Garnavich et al. (IUAC 8108) continue to develop. Subtracting a scaled version of the Apr. 4.27 UT power-law spectrum from the Apr. 8.13 spectrum reveals an energy distribution remarkably similar to that of the SN1998bw a week before maximum light (Patat et al. 2001, ApJ, 555, 900). This spectrum can be seen at http://cfa-www.harvard.edu/~tmatheson/compgrb.jpg The spectral similarity to SN 1998bw and other 'hypernovae' such as 1997ef (Iwamoto et al. 2000, ApJ, 534, 660) provides strong evidence that classical GRBs originate from core-collapse supernovae. This message may be cited.
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
