Spectroscopic observation of CSS161010 and SN2016gxp by NUTS (NOT Un-biased Transient Survey)

ATel #9645; T. Reynolds (Turku, NOT), S. Dong (KIAA-PKU), M. Fraser (University College Dublin), M. Stritzinger (Aarhus U), S. Mattila (Turku), P. Lundqvist (Stockholm), N. Elias-Rosa (INAF-Padova), J. Harmanen (Turku), T. Kangas (Turku), A. Somero (Turku), H. Kuncarayakti (MAS, DAS), F. Taddia (OKC)
on 18 Oct 2016; 17:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Reynolds (treynolds1729@gmail.com)

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The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of the hostless transient CSS161010:045834-081803 and further observation of SN2016gxp in NGC51. The candidates were discovered by the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870 ; http://crts.caltech.edu/ ) and by the Puckett Observatory Supernova Search respectively. SN2016gxp was previously classified as a probable Ia from a low resolution spectrum (R~150) taken at the Three Hills observatory by Robin Leadbeater.

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

 
Survey Name             | IAU Name  | Discovery (UT)| Discovery mag | Observation (UT)    | Redshift   | Type   | Phase   | Notes  
CSS161010:045834-081803 | -         | 2016-10-10.48 | 16.3          | 2016-10-18.14       |  -         | -      |   -     | (1)  
SN2016gxp               | SN2016gxp | 2016-10-05.31 | 18.6          | 2016-10-15.05       | 0.0178     | Ia-Pec | Pre-max | (2)  
 

(1) The spectrum is a blue continuum exhibiting no features and a blackbody temperature of ~15kK. (2) Comparison of the spectrum with a library of supernova spectra using SNID reveals it matches well with pre-maximum spectra of the Super-Chand. candidate SN 2007if as well as young 1991T-like SN.

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.