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Palomar spectroscopic observations of CRTS optical transients

ATel #6288; A. J. Drake (Caltech); S. Abraham (St. Thomas Col., India); S. G. Djorgovski, M. J. Graham, A. A. Mahabal, R. Williams (Caltech); J. L. Prieto (Princeton); M. Catelan (PUC Chile); E. Christensen, S. M. Larson (LPL/UA)
on 4 Jul 2014; 03:03 UT
Credential Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7156

Further to ATel#6199, here we report the classification of CRTS optical transients observed with the Palomar 5m+DBSP on June 30 UT. Spectra were cross-correlated using SNIDs software (Blondin and Tonry 2007, ApJ, 666, 1024) and the following results were found:

CRTS ID Type Match age z Notes
CSS140505:143511+134946 Ic-lum? 1
CSS140622:133751+340948 Ia 1999ee +11 0.07
CSS140627:173000+403615 IIn 0.06 2
CSS140628:233025+060302 Ia 2003du -1 0.06
CSS140628:164427+285658 Ia 2003du 0 0.053 3

1, This object exhibits a blue featureless continuum similar to the early spectra of super-luminous 
supernovae discovered by CRTS, eg. CSS121015:004244+132827 (Drake et al. 2012, ATel#4498;  
Tomasella et al. 2012, ATel#4512; Benetti et al. 2014, MNRAS, 441, 289). The location of the  
transient matches a faint red source detected by SDSS with u=23.9, g=23.3, r=21.6, i=20.8, z=20.2. 
No match was found with FIRST or NVSS radio data. 
2, The spectrum exhibits strong broad and narrow Balmer components. 
3, The redshift is based on narrow lines from the host galaxy. 

All CRTS transients are discovered within minutes of observation and openly published to VOEvent network subscribers (such as http://Skyalert.org ). Links to all CRTS transients can be found at http://crts.caltech.edu/.