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FLOYDS Classification of PSN J23002463+0137368 as a Peculiar Type Ib Supernova similar to SN 2005bf

ATel #7896; S. Valenti, I. Arcavi, G. Hosseinzadeh, C. McCully, D. A. Howell, (LCOGT/UCSB)
on 9 Aug 2015; 18:25 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefano Valenti (svalenti@lcogt.net)

Subjects: Optical, Supernovae

Referred to by ATel #: 7930

We obtained a spectrum of PSN J23002463+0137368 (ATel #7886) on 2015 August 9.42 UT with the robotic FLOYDS instrument mounted on the Faulkes Telescope North. Using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) we find a good fit to the peculiar Type Ib SN 2005bf a few days before maximum light at the redshift of the proposed host galaxy UGC 12295 (z= 0.016; Falco et al 1999, PASP, 111, 438F via NED). Superfit (Howell et al. 2005, ApJ, 634, 1190) finds a reasonable match to the Type Ib SN 1999ex a few days after peak (though at slower expansion velocities than seen in our spectrum) at the same redshift. Our spectrum displays He I absorption features consistent with an expansion velocity of 8,000 km/s and Fe II at 9,000 km/s (SN 2005bf also had the peculiar property of higher velocity Fe II compared to He I). An absorption feature around rest-wavelength 622.0 nm (seen also for SN 2005bf) is consistent with Si II at 6,000 km/s or H-alpha at 16,000 km/s. Additional followup of this peculiar supernova is encouraged.