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Spectroscopic observation of Gaia17afo (AT 2017on) by NUTS (NOT Un-biased Transient Survey)

ATel #10009; A. Pastorello, N. Elias-Rosa, S. Benetti, E. Cappellaro, G. Terreran, L. Tomasella (INAF-Padova), E. Grafton (NOT)
on 26 Jan 2017; 12:21 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Andrea Pastorello (andrea.pastorello@oapd.inaf.it)

Subjects: Optical, Supernovae, Transient, Variables

The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of Gaia17afo (AT 2017on). The candidate was discovered by the Gaia Photometric Science survey.

The observation(s) was(were) performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.8 nm FWHM).

Survey Name    | IAU Name   | Discovery (UT)  | Discovery mag | Observation (UT) | Redshift | Type | Phase   | Notes  
Gaia17afo      | SN2017on   | 2017-01-22.885  | 18.5          | 2017-01-26.D1    | 0.035    | Ia   | +3d    | (1)  

(1) The redshift of the faint host galaxy has been inferred through the best fit of the main supernova spectral lines. The expansion velocity of the ejected material, as derived from the minimum of the 635.5 nm Si II line, is about 10400 km/s.

Classification was performed using the GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tools. Calibrated spectra and additional information can be retrieved in the IAU Transient Name Server. We acknowledge ESA Gaia (http://cosmos.esa.int/gaia), and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts) (Rixon et al, 2014, ATel #6593).