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Spectroscopy of CSS transients and variables

ATel #1520; Mahabal, A.; Djorgovski, S. G.; Drake, A. J.; Williams, R.; Graham, M. J.; Quimby, R.; Chung, A. (Caltech); Myers, A. (UIl); Beshore, E. C.; Larson, S. M. (LPL/UAz); Christensen, E. (Gemini Obs.);
on 13 May 2008; 23:12 UT
Credential Certification: Ashish Mahabal (aam@astro.caltech.edu)

Subjects: Optical, Quasar, Supernovae, Transient, Variables

Spectra of several optical transients and variables from the Catalina Sky Survey were obtained at the Palomar 200-inch telescope using the Double Beam Spectrograph, on the nights of UT 2008 May 5, 6, and 7.

The transients were all published in real-time on the VOEventNet pages at www.voeventnet.org. The other candidates were chosen based on their variability. Their spectroscopic identifications are as follows:

CSS080409:154159+235603 = possible blazar, blue continuum with a possible broad line at ~ 5530A; if this is Mg II 2799, then z ~ 0.98.
CSS080427:152242+302208 = Type Ia SN, about 2 weeks past max, z~0.065
CSS080506:120951+181007 = Radio source. Possibly blazar, if the solitary broad line seen is MgII, the z is ~0.84
CSS080505:155415+105825 = Type IIn SN, 2008cg, z=0.0362 (CBET 1368)
CSS080505:163120+103134 = Weak H-alpha plus blue continuum

CSSV :115254+142626 = Intermediate stellar spectra; abs. lines seen (e.g. 4000 Ang. break); no obvious emission lines
CSSV :202853-123934 = He lines
CSSV :205312-043807 = Mstar
CSSV :210232+110748 = Mstar
CSSV :210642+081249 = Mstar

The M-stars likely got picked due to strong chromospheric flares.