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FLOYDS Classification of ASASSN-17lz/AT 2017grw as a Young Type Ia Supernova

ATel #10750; G. Hosseinzadeh, I. Arcavi, D. A. Howell, C. McCully (Las Cumbres Obs./UCSB), S. Valenti (UC Davis)
on 14 Sep 2017; 21:46 UT
Credential Certification: Griffin Hosseinzadeh (griffin@lco.global)

Subjects: Optical, Supernovae

We obtained a spectrum of ASASSN-17lz/AT 2017grw on 2017 September 14.3 UT with the robotic FLOYDS instrument mounted on the Las Cumbres Observatory 2-meter telescope on Haleakala, Hawai'i. Using SNID (Blondin & Tonry 2007, ApJ, 666, 1024), we find good fits to several normal Type Ia supernovae in the week before maximum light at redshifts consistent with that of the proposed host galaxy (z=0.017; Barmby & Huchra 1998, AJ, 115, 6 via NED). The supernova is highly extinguished by its host galaxy, making a more precise phase estimate difficult. The spectrum is available on the Transient Name Server.