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Spectroscopic observation of SN 2016ieq and SN 2016isg by NUTS (NOT Un-biased Transient Survey)

ATel #9836; T. Kangas, S. Mattila (Turku), M. Stritzinger (Aarhus), S. Dong (KIAA-PKU), E. Hsiao (FSU), P. Lundqvist, F. Taddia (Stockholm), E. Kankare (QUB), H. Kuncarayakti, J. Harmanen, A. Somero, T. Reynolds (Turku), M. Ergon (Stockholm), E. Gafton (NOT), on behalf of the NUTS collaboration
on 8 Dec 2016; 15:04 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Tuomas Kangas (tjakan@utu.fi)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 9837, 9856

The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of the supernovae SN 2016ieq/Gaia16buy in the host galaxy APMUKS(BJ) B211942.51-120949.1 and SN 2016isg/ASASSN-16oo in the host galaxy 2MASX J01411858-0012382. The candidates were discovered by the Gaia Photometric Science Alerts programme and the All-Sky Automated Survey for Supernovae (ASAS-SN; ATel #8944, #8979), respectively.

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  
Gaia16buy      | SN 2016ieq | 2016-11-14.43   | 17.95         | 2016-12-07.88    | 0.066    | IIn  |  --      | (1)  
ASASSN-16oo    | SN 2016isg | 2016-12-06.08   | 16.8          | 2016-12-07.92    | 0.055    | Ia   | post-max | (2)  

(1) Emission lines of the Balmer series, composed of a narrow (unresolved) peak and a broader (~2500 km/s) base component are superimposed onto a blue continuum, consistent with a type IIn SN. A weak He I 5876 Å line is also visible. The redshift is from the H-alpha line. At this redshift, the discovery magnitude corresponds to an absolute magnitude of -19.4.

(2) Good matches to the transient are provided by normal type Ia SNe after maximum light. However, the discovery magnitude at the redshift of the host galaxy corresponds to an absolute magnitude of -20.2.

We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts). Classifications were 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.