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Classification of MASTER OT J105145.85+552312.4 as Type Ia SN

ATel #9156; A. S. Moskvitin and T. A. Fatkhullin (SAO RAS)
on 15 Jun 2016; 11:35 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, Supernovae, Transient

We observed the field of SN candidate MASTER OT J105145.85+552312.4 discovered in PGC 032587 (AGN) by V. Shumkov, E. Popova, V. Lipunov et al. (ATel #9104). The observations carried out with the 6-meter BTA telescope of SAO RAS equipped with the Scorpio-I focal reducer on the 2016 June, 2.863 (mid. time). We obtained 2 x 600 sec. spectra covered 3500-7200AA range with the resolution of FWHM = 10A. The spectrum of OT is most consistent with the normal Type Ia SN 1992A near the maximum, redshifted by z = 0.080 +/- 0.003. Cross-correlation made using SNID package (Blondin and Tonry 2007, ApJ. 666, 1024). We should note that redshift of the host galaxy is slightly lower, z = 0.074 (based on NED information). The brightness of SN was R = 18.7 +/- 0.1. Photometry is based on the nearby USNO-B1 stars.