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Spectroscopic observation of ASASSN-17nb and CSS170922:172546+342249 by NUTS (NOT Un-biased Transient Survey)

ATel #10823; J. Harmanen, S. Mattila, H. Kuncarayakti, T. Reynolds (Turku), A. Somero (MAGIC/Turku), T. Kangas (STSci), P. Lundqvist, F. Taddia, M. Ergon (Stockholm), S. Dong (KIAA-PKU), A. Pastorello (Padova) and T. Pursimo (NOT) on behalf of the NUTS collaboration.
on 5 Oct 2017; 17:49 UT
Credential Certification: Seppo Mattila (seppo.mattila@utu.fi)

Subjects: Optical, Supernovae, Transient

The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of ASASSN-17nb in MCG+06-17-007 and CSS170922:172546+342249 in an unknown host galaxy. The candidates were discovered by the All-Sky Automated Survey for Supernovae (ATEL #8944, #8979) and the Catalina Real-time Transient Survey (CRTS; Drake et al. 2009, ApJ, 696, 870 ; http://crts.caltech.edu/ ), 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  
ASASSN-17nb    | SN 2017hbg | 2017-09-25.58   | 17.3          | 2017-10-05.16    | 0.016    | II   | a few weeks | (1)  
CSS170922      | -          | 2017-09-22.18   | 18.4          | 2017-10-04.85    | 0.065    | Ia   | at max      | (2)  

(1) Redshift from SNID. Consistent with type II SNe a few weeks after the explosion.

(2) Redshift from SNID. Best matches to several normal type Ia SNe around the maximum light.

Classifications were performed using the SNID (Blondin and Tonry 2007, ApJ, 666, 1024) tool. Calibrated spectra and additional information can be retrieved from the IAU Transient Name Server.