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BTA spectroscopic classification of three Type Ia SNe

ATel #7174; A. S. Moskvitin, T. A. Fatkhullin, V. N. Komarova, V. V. Sokolov (SAO RAS), S. B. Pandey (ARIES), V. M. Lipunov (Lomonosov MSU, SAI)
on 4 Mar 2015; 10:46 UT
Credential Certification: Alexander Moskvitin (mosk@sao.ru)

Subjects: Optical, Supernovae, Transient

We observed three SN candidates discovered by MASTER and CRTS with the 6-meter BTA telescope of SAO RAS equipped with the Scorpio-I focal reducer (Afanasiev & Moiseev, 2005, Astronomy Letters, 31, 194) on the 2015 February, 25-27 set.

SNID software (Blondin and Tonry 2007, ApJ, 666, 1024) cross-correlations of the spectrum of MASTER OT J100540.87+134751.1 (Shumkov et al., ATel #7127) obtained on the 2015 February, 26.844 UT is most consistent with the normal Type Ia SN 1996ab at the phase +1 day, redshifted by z = 0.064 +/- 0.004. MASTER OT has a brightness R = 18.59 +/- 0.06 (2015/02/26.829).

The spectrum of the MASTER OT J081659.74+511233.7 (Balanutsa et al., ATel #7129) obtained on 2015 February, 25.708 is most consistent with the normal Type Ia SN 1994ae at a phase +11, redshifted by z = 0.044 +/- 0.004. The brightness of MASTER OT was R = 17.34 +/- 0.09 (2015/02/25.695).

The spectrum of CSS150220:085109+443352 obtained on 2015 February, 25.763 is most consistent with the Type Ia SN 1991T at a phase +11, redshifted by z = 0.152 +/- 0.005. This estimate is supported by presence of H-alpha and [O III] 5007A lines redshifted by z = 0.158 +/- 0.002. The brightness of CSS150220 was R = 20.15 +/- 0.11 (2015/02/25.725).