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Asiago spectroscopic classification of six optical transients

ATel #7012; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF OAPd)
on 31 Jan 2015; 10:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Enrico Cappellaro (enrico.cappellaro@oapd.inaf.it)

Subjects: Optical, Supernovae

Referred to by ATel #: 7014

The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841) reports the spectroscopic observation of the following transients. Targets were supplied by the Astronomy Section of the Rochester Academy of Sciences (arXiv:1103.5165), the CBAT Transient Objects Confirmation Page (TOCP) and the Gaia Photometric Science Alerts (validation phase).

The observations were performed with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.2 nm), which was equipped with the CCD Andor IKON L936.

 
Name                        | Date (UT)    |    z     | Type  |  Phase     | Notes        
PSN J05521661+4650211       | 20150130.94  |  0.0224  |  Ic?  | +2 weeks ? | (1) 
PSN J11105565+5322493       | 20150130.99  |  0.0094  |  II   | +1 week     | (2) 
Gaia15aar                   | 20150131.03  |  0.05    |  Ia   | post-max   | (3) 
Gaia15aaq                   | 20150131.07  |  0.0625  |  Ia   | at max     | (4) 
MASTER OTJ180153.15+254323.5| 20150131.20  |    -     |  CV   |            | (5) 
Gaia15aao                   | 20150131.23  |  0.0343  |  Ia   | +2 weeks   | (6) 

1 - Uncertain classification because the spectrum is of low S/N and heavily contaminated by the emission of the host galaxy, MCG +8-11-10. The host galaxy redshift is from Thereau et al. 1998 A&AS 130, 333 via NED. 2 - Best match with Type-II SN 2012A (Tomasella et al. 2013, MNRAS 434, 1636) at about one week after explosion. The redshift for the host galaxy, NGC3549, is from De Vaucouleurs et al. 1991, RC3.9 via NED.

3 - Host galaxy is SDSS J133209.07+344128.2 (photometric redshift z=0.070 from SDSS). Good matches are obtained with normal type-Ia SNe around one week after B-band maximum light.

4 - Host galaxy is SDSS J134124.97+354540.6 (redshift from SDSS via NED). Good matches are obtained with several normal type-Ia SNe around B-band maximum light.

5- Optical transient discovered by MASTER (ATel #7010) in the error box of GRB 150128; the spectrum shows a very blue continuum with narrow absorption features of the Balmer series and HeII lines at rest wavelength.

6- Host galaxy is SDSS J154411.96+111614.7 (redshift from Haynes et al. 2011 AJ 142, 170 via NED). The best match is obtained with SN2002bo at 16d.

Classification was done with GELATO (Harutyunyan et al. 2008, A&A, 488, 383) and SNID (Blondin and Tonry 2007, ApJ, 666, 1024). The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

We acknowledge ESA Gaia (http://cosmos.esa.int/gaia), and the DPAC Photometric Science Alerts Team (http://gaia.ac.uk/selected-gaia-science-alerts).