Palomar spectroscopic classification of CRTS optical transients
ATel #7156; FirstnameA. J. Drake, D. Stern, S. G. Djorgovski, M. J. Graham, A. A. Mahabal, R. Williams (Caltech); M. Catelan (PUC Chile); E. Christensen, S. M. Larson (LPL/UA)1 Lastname1 (Affil1), Firstname2 Lastname2 (Affil2)...
on 27 Feb 2015; 17:57 UT
Credential Certification: Andrew J. Drake (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Further to ATel#6288, we report the classification of CRTS optical transients
observed with the Palomar 5m+DBSP on 2015 Feb 15 UT. The spectra were cross-correlated
using SNIDs software (Blondin and Tonry 2007, ApJ, 666, 1024) and the
following results were found:
1. We find that the best matching SN templates for SNhunt278 (=CSS150214:140955+173155, =PSNJ14095513+1731556) are normal type-Ia's pre-maximum light. This is consistent with the faint absolute magnitude at the time of detection (Mv~-16). This result is in contrast to the later phases found by Mitra et al. 2015 ATel#7074 and Baumont et al. (2015, ATel#7091).
2. The classification of CSS150213:100134+453359 is consistent with Elias-Rosa et al. (2015, ATel#7120).
3, The best SN template match for CSS150210:085514-080940 is consistent with that given by Le Guillou et al. (2015, ATel#7068).
4, CSS150207:081700+511235 (=MASTER OT J081659.74+511233.7) was discovered by CRTS on 2015-02-07. As the transient is associated with a red SDSS point source, it was initially noted as being of an unknown type. On 2015-02-13 the object was redetected and publicly reclassified as a likely supernova. The source was subsequently detected by the MASTER project on 2015-02-21 UT (Balanutsa et al. 2015, ATel#7129).
5. The spectrum of CSS141223:113342+004332 (= MLS150211:113342+004333, = PS1-15ae) exhibits features most consistent with type-Ic SNe. Nevertheless, no good SNIDs SN template matches were found. This result appears to support the superluminous type-Ic classification of Le Guillou et al. (2015, ATel#7068).
All CRTS transients are discovered within minutes of observation and openly
published to VOEvent network subscribers. Links to all CRTS transient discoveries
can be found at http://crts.caltech.edu/.