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Classification of CRTS optical transients

ATel #4498; A. J. Drake, A. A. Mahabal, S. G. Djorgovski, M. J. Graham, R. Williams (Caltech); J. Prieto (Princeton); M. Catelan (PUC Chile); E. Christensen, S. M. Larson, E. C. Beshore (LPL/UA).
on 18 Oct 2012; 20:45 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 4512, 4595, 6288

Further to Atel#4463, here we report the classification of CRTS optical transients observed with the Palomar 5m+DBSP on Oct 14th and 15th UT. Spectra were cross-correlated using SNIDs software (Blondin and Tonry 2007, ApJ, 666, 1024). The following results were found:

CRTS ID Type Match/age z Notes
CSS121014:233045-124838 Ia SN1999aa -1 0.13 a
CSS121011:163803+372814 Ia SN1999ac +17 0.04 a
CSS121009:011101-172841 Ia SN2002bo -5 0.06 a
CSS121009:025917-141610 IIn 0.08 a
CSS121006:232854+085452 Ia SN1996X +8 0.08 b
MLS121006:234856-023650 Ia SN1995E +10 0.08 b
MLS121004:005748+061812 Ia SN1999ee +11 0.15 b
CSS120926:171458+344754 Ia SN1991M +26 0.09 b
CSS120925:003040+123156 Ia SN1989B +20 0.10 b
CSS120917:164704+231612 Ia SN1989B +13 0.12 b
CSS120914:215710+055647 Ic-broad? SN2006aj 0.05 b / c
CSS121015:004244+132827 I? *

a, discovery info is available the CRTS website (crts.caltech.edu). 
b, discovery details are given in Drake et al. (2012, Atel#4463). 
c, Noisy spectrum. 
* The location of this object matches a very faint (r > 21.5) uncataloged source seen in  
SDSS images and was detected on 2012-09-16, 2012-09-25, 2012-10-06 and 2012-10-15, with  
V~20.0, 19.1, 18.5, and 18.3, respectively.  
The source exhibits a very blue continuum spectrum with no clear emission features,  
and resembles the early spectra of past luminous type-I supernovae detected by CRTS: 
SSS120810:231802-560926 (Wright et al. 2012, Atel#4313, Inserra et al. 2012, Atel#4329), 
CSS120121:094613+195028 (=PS1-12fo, Smartt et al. 2012, Atel#3918), 
CSS111230:143658+163057 (Prieto et al. 2011, Atel#3883),  
CSS110406:135058+261642 (Drake et al. 2011, Atel#3343),  
CSS110116:114913+382427 (Prieto et al. 2011, Atel#3126),  
CSS100313:112547-084941 (=SN2010gx, Mahabal et al. 2010, ATel#2490, ATel#2508; Pastorello 2010, ApJ, 724, L16), 
CSS090802:144910+292510 (=SN2009jh, =PTF09cwl)  (Drake et al., Quimby et al. 2009, CBET#1958; Quimby et al. 2011, Nature, 474, 489).  
Further observations are necessary to determine the nature of this possible luminous supernova.