Spectroscopic classification of Gaia17bbt and ATLAS17fgz by NUTS (NOT Un-biased Transient Survey)

ATel #10403; E. Kankare (QUB), M. Fraser (UCD), A. Hamanowicz (Warsaw), T. Wevers (Nijmegen RU), Z. Kostrzewa-Rutkowska (SRON), F. Onori (SRON), G. Cannizzaro (SRON), L. Wyrzykowski (Warsaw), P. Jonker (SRON), M. Dennefeld (IAP, UPMC), G. Leloudas (Weizmann), I. Rivero Losada (NOT) on behalf of the NUTS collaboration.
on 19 May 2017; 15:31 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Erkki Kankare (e.kankare@qub.ac.uk)

Subjects: Optical, Supernovae, Transient

The Nordic Optical Telescope (NOT) Un-biased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classifications of Gaia17bbt and ATLAS17fgz in host galaxies UGC 10019 and 2MASX J11094531+4624352, respectively. The candidates were discovered by the Gaia Photometric Science survey and the ATLAS survey (Tonry et al. 2011, PASP, 123, 58; ATel #8680).

The observations were performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.6 nm FWHM).

 
Survey Name    | IAU Name   | Discovery (UT)  | Discovery mag | Observation (UT) | Redshift | Type | Phase       | Notes  
Gaia17bbt      | SN2017dgs  | 2017-04-23.30   | 17.6          | 2017-05-19.10    | 0.032    | II   | +40 d       | (1)  
ATLAS17fgz     | SN2017ebp  | 2017-05-14.25   | 18.6          | 2017-05-18.92    | 0.074    | Ia   | -7 to -4 d  | (2) 

(1) Good match with SN 1998S and SN 1979C. (2) Normal Type Ia.

Classifications were performed using the SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tool. 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://gsaweb.ast.cam.ac.uk/alerts/) (Rixon et al, 2014, ATel #6593).