MASTER OT081443.89 +125459.7 and 4 Supernovae from CRTS

ATel #3724; L. Magill, D. Wright, R. Kotak, S. Smartt, M. Fraser (Queen's University Belfast)
on 29 Oct 2011; 11:14 UT
Credential Certification: Stephen Smartt (s.smartt@qub.ac.uk)

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We report that spectra were obtained at the Nordic Optical Telescope (+ ALFOSC) by J. Lykke of MASTER OT 081443.89+125459.7, (ATel #3715) MLS111018:035322+190349 (ATel #3706) MLS110927:020135+233303, (ATel #3706) PSN J04054651+1912218 (= MLS111001:002408+073155 (ATel #3706)) and MLS111022:081449+192315 (ATel #3706) on Oct. 28.24, 28.08, 28.05, 27.92 and 28.16 UT, respectively. The spectra have a range from 350-900nm. The spectrum of MASTER OT 081443.89+125459.7 has a blue continuum, with H I Balmer lines and He I in absorption. The width and velocity of the source indicates that it is of Milky Way origin (ATEL 3721). The faint blue SDSS source (r=21.7) that it is coincident with the MASTER OT was morphologically classified as a star in SDSS DR6 (SDSS J081443.90+125500.0). MLS111018:035322+190349, MLS110927:020135+233303, PSN J04054651+1912218, and MLS111022:081449+192315 were cross-correlated against a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024). They all resemble normal type Ia supernovae at redshifts of 0.11, 0.15, 0.14, and 0.10, respectively, with best-fit epochs of +11d, +24d, +34d, and +34d.