SIMBAD references

M. Riello, S. Benetti, E. Cappellaro, F. Patat, M. T. Botticella, G. Altavilla, A. Pastorello, M. Turatto, and S. Valenti report the discovery of six supernovae on CCD frames taken on Feb. 18 during a search performed with the Max-Planck-Institut 2.2-m telescope (+ Wide Field Imager) at the European Southern Observatory (ESO). SN R.A. (2000.0) Decl. V Offset z Type 2004ae 4 28 17.89 -36 18 55.0 23.3 < 0'.3 0.480 II 2004af 5 38 03.91 -23 59 00.2 22.5 3'.2 W, 4'.3 S 0.056 Ic 2004ag 9 51 01.49 -20 50 37.5 23.0 < 0'.5 0.362 II 2004ah 10 45 47.41 - 0 06 58.1 23.3 < 0'.8 0.480 Ia 2004ai 13 54 26.09 -12 41 15.9 23.4 1'.0 S 0.590 Ic 2004aj 14 20 37.58 -12 24 14.4 22.3 0.247 Ia Nothing was visible at the above positions on reference images taken during 2001-2002. Spectroscopy (range 600-1100 nm), obtained on Feb. 26 and 27 with the ESO 8.2-m YEPUN telescope (+ FORS2), reveals that each supernova was caught around maximum, with the exception of 2004af, which shows very strong nebular emission lines of Mg I], Na I, [O I], [Ca II], and Ca II, and 2004af bears a strong resemblance with that of SN 1998bw at about 6 months past maximum light (Patat et al. 2001, Ap.J. 555, 900). The enhanced emission that is observed in the range 400-550 nm may also be attributed to a blend of Fe lines. The absolute magnitude of 2004af, M(R) = -14.3 (H_o = 72 km/s/Mpc), is unusually bright for a type-Ib/c event at these phases and implies a maximum brightness M(R) < -19. This, coupled with the spectral appearance, make 2004af a hypernova candidate.