2003IAUC.8203....2M

N. Morrell and M. Hamuy, Carnegie Observatories, report that a spectrum (range 400-730 nm) of SN 2003ib (cf. IAUC 8201), obtained on Sept. 18.17 UT with the Las Campanas Dupont 2.5-m telescope (+ Modular Spectrograph), shows it to be a young type-II supernova characterized by a blue continuum and H_alpha, H_beta, and He I 5876 lines exhibiting P-Cyg profiles. A redshift of approximately 0.024 ± 0.001 is derived, based on the maximum of the H_alpha emission; assuming this redshift, the minimum of the H_beta line yields an expansion velocity of -7700 km/s. A spectrum of SN 2003ic (cf. IAUC 8201), obtained on Sept. 18.25, shows it to be a type-Ia supernova; the spectrum is similar to that of SN 1994D taken 5 days before maximum. The minimum of the Si II 635.5-nm line yields an expansion velocity of -12200 km/s (adopting the NED host-galaxy recession velocity of 16690 km/s). A spectrum of SN 2003id (cf. IAUC 8201), obtained on Sept. 18.33, shows it to be a type-Ic supernova. The spectrum, which has strong absorptions centered at 491 nm (possibly Fe II blends) and 607 nm together with a P-Cyg profile whose minimum is centered at 645 nm, bears some resemblance to that of SN 1994I taken 4 days before maximum (Filippenko 1997, ARAA 35, 309).