Early time observations and rapid classification of Supernovae at Telescopio Nazionale Galileo

AOT 14 and AOT 15

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SN 2007bg   Date: 20.04.2007     Type: II     Host galaxy: unknown     CBET: 948 SN 2007bg was originaly classified as a type-Ic SN (CBET 927). In fact, our SN spectra comparison program finds SN 1998bw spectrum of 19 days after maximum as the best match to the SN 2007bg one. However, the broad and strong feature centered at 6524Å is probably due to H-alpha, thus we re-classify SN 2007bg as an energetic type-II SN. We are performing follow-up observations for this SN.

SN 2007av   Date: 22.03.2007     Type: II     Host galaxy: NGC 3279     CBET: 903 This spectrum of SN 2007av is most similar to that of SN 1996W at 8 days after its discovery. SN 2007av is classified as a type-II SN at few days after explosion.

SN 2007T   Date: 06.02.2007     Type: II     Host galaxy: NGC 5828     CBET: 837 SN 2007T classified as a type-II SN. The spectrum is similar to that of SN 1995ad at 10 days after explosion.

SN 2007R   Date: 30.01.2007     Type: Ia     Host galaxy: UGC 4008     CBET: 826 SN 2007R is a type-Ia SN near maximum light, its spectrum of 30.01.2007 closely resembles that of SN 1996X at 1 days after maximum.

SN 2007O   Date: 22.01.2007     Type: Ia     Host galaxy: UGC 9612     CBET: 818 SN 2007O is classified as a type-Ia SN. The spectrum of SN 2007O obtained on 22.01.2007 is very similar to that of SN 2003du one at 1 day before maximum light.

SN 2007K   Date: 17.01.2007     Type: IIn     Host galaxy: MCG +06-20-50     CBET: 813 The best match to SN 2007K 17.01.2007 spectrum is that of type-IIn SN 2003G at 4 days after discovery.

SN 2007B   Date: 08.01.2007     Type: Ia     Host galaxy: NGC 7315     CBET: 799 SN 2007B is classified as a type-Ia supernova caught near maximum light. The best fit to this spectrum is with that of SN 1992A at 5 days before maximum light.

SN 2006jc   Date: 11.10.2006     Type: Ib-pec     Host galaxy: UGC 4904     CBET: 674 This is the first spectrum of a peculiar type-Ib SN 2006jc. The inspection of the spectrum showed the peculiarity of the object, so follow-up observations have been triggered. The results of the campaign are published in Pastorello et al., Nature (in press, arXiv:astro-ph/0703663).

SN 2006gy   Date: 25.09.2006     Type: II     Host galaxy: NGC 1260     CBET: 647 This is the first spectrum of SN 2006gy, showing that it was a type-II SN. Its continuum shape and presence of Na I D feature suggest heavy dust extinction. On the plot, the spectrum of SN 2006gy, dereddened by E(B-V)=0.87mag, is fitted with that of type-II SN 2000eo at 10 days after its discovery date. We are performing folow-up observations for this SN.

SN 2006en   Date: 28.08.2006     Type: Ia     Host galaxy: MCG +05-54-41     CBET: 608 This spectrum of SN 2006en shows that it is a type-Ia supernova near maximum light. The best fit to this spectrum is by that of SN 2003du at 4 days after maximum.