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.
