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
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? | | | * |
Notes:
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.
