SIMBAD references

R. Kotak and W. P. S. Meikle, Imperial College, London, on behalf of the European Supernova Collaboration, report that spectra (resolution 0.27 nm) of the possible supernova reported on IAUC 8121, obtained at the Isaac Newton Telescope (+ IDS spectrograph) by P. Rodriguez-Gil on Apr. 26.11 (range about 500-750 nm) and Apr. 27.06 UT (range about 350-570 nm), indicate that it is of type IIn, about 1 week past explosion. The spectrum comprises a blue continuum upon which a number of emission features are superposed. The continuum appears to show a break at about 530 nm, blueward of which it becomes steeper. The spectrum lacks broad P-Cyg-type profiles and bears a striking resemblance to early-epoch spectra of the type-IIn SN 1998S (IAUC 6829; Leonard et al. 1999, Ap.J. 536, 239; Fassia et al. 2001, MNRAS 325, 907). Balmer lines in emission are present and exhibit a multicomponent structure. The H_alpha profile comprises a narrow but resolved component (FWHM about 350 km/s) superposed on a much broader profile of FWZI about 10000 km/s. The narrow component appears to lie slightly redward (about 350 km/s) of the peak of the broad component. A broad emission feature at about 470 nm is present, which is attributed to a blend of He II 468.6-nm and C III 464.8-nm/N III 464.0-nm (cf. SN 1998S; IAUC 6832). A weak He I 587.6-nm emission feature may also be present. In SN 1998S, the early-time emission features yielded valuable information about the interaction of the supernova with the 'circumstellar medium' of the progenitor star, but these features persisted for barely 10 days. High-resolution spectral coverage over the next few days is urged.