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ROTSE3 J114340.5+485056 and ROTSE3 J125708.9-172527 are Type Ia Supernovae

ATel #2489; R. M. Quimby, D. Levitan (Caltech)
on 19 Mar 2010; 05:35 UT
Credential Certification: Robert Quimby (quimby@astro.as.utexas.edu)

Subjects: Optical, Supernovae, Transient

We obtained spectra (320-1000 nm) of two ROTSE-III supernova candidates using the 5.1-m Palomar telescope (+DBSP) on March 18.4 UT. We find ROTSE3 J114340.5+485056 (ATel #2481) to be a normal Type Ia supernova a few days past maximum at a redshift of approximately z=0.08. In this frame, the minimum of the SiII (rest 635.5 nm) line is blue shifted by about 13,000 km/s. ROTSE3 J125708.9-172527 (ATel #2485) is also a Type Ia supernova around maximum. Adopting the rest frame of the apparent host (z=0.049), the minimum of the SiII line is blue shifted by about 10,000 km/s.