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FLOYDS Classification of MASTER OT J220443.74-331330.6 as an Old Type Ia Supernova

ATel #7820; G. Hosseinzadeh, C. McCully, I. Arcavi, S. Valenti, D. A. Howell (LCOGT/UCSB)
on 21 Jul 2015; 02:57 UT
Credential Certification: Iair Arcavi (iarcavi@lcogt.net)

Subjects: Optical, Supernovae

We obtained a spectrum of MASTER OT J220443.74-331330.6 (ATel #7793) on 2015 July 20.7 UT with the robotic FLOYDS instrument mounted on the Faulkes Telescope South. Using Superfit (Howell et al. 2005, ApJ, 634, 1190) and SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find a good fit to the normal Type Ia SN 1996X 23 days after maximum light at a redshift consistent with that of the proposed host galaxy (z=0.059; Colless et al. 2003, "The 2dF Galaxy Redshift Survey Final Data Release" via NED).