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ePESSTO spectroscopic classification of the optical transient MASTER OT J034412.48-263556.5

ATel #11013; Z. Kostrzewa-Rutkowska (SRON/RU), K. M. Lopez (SRON/RU), G. Cannizzaro (SRON/RU), P. G. Jonker (SRON/RU), T.-W. Chen (MPE), M. Fraser (University College Dublin), J. Sollerman (OKC), C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), J. Tonry, B. Stalder, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI)
on 27 Nov 2017; 09:50 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: P.G. Jonker (p.jonker@sron.nl)

Subjects: Optical, Supernovae

ePESSTO, the extended Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the classification of MASTER OT J034412.48-263556.5 as a supernova. All observations were performed on the ESO New Technology Telescope at La Silla on 2017 Nov 24, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). The classification was done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra and additional details can be obtained from http://www.pessto.org (via WISeREP).

Lipunov et al. (Atel #10929) , Wang et al. (ATel #10935) and McBrien et al. (ATel #10940) reported a rising transient with a persistent blue and featureless spectrum. Our previous ePESSTO spectrum (Onori et al. ATel #10950, in which the transient was labelled ATLAS17mzy), also showed a blue and featureless continuum. The spectrum has now evolved to resemble the supernova Type II 1998S at about 30 days after peak.

The object has the same redshift as the putative host galaxy 2MASX J03441248-2635352 (hence it is associated with it) but it is found at 27 kpc from the galaxy which is peculiar for a Type II supernova. Furthermore, the peak absolute magnitude was about -19.2 which is bright for Type II supernovae. The source is declining fast at present.

Survey Name | IAU Name  | RA (J2000) | Dec (J2000) | Disc. Date | Source | Disc Mag |  z    | Type | Phase | Notes 
MASTER OT J034412.48-263556.5  |           | 03:44:12.48 |  -26:35:56.5 | 20171001 | ATLAS  |   20.4   | 0.0669 |  II  | well after peak    | --