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PESSTO spectroscopic classification of optical transients

ATel #8152; J. Lyman (Warwick), H. Campbell (Cambridge), M. Fraser (Cambridge), T.-W. Chen (Bonn), A. De Cia (ESO), I. Manulis (Weizmann), C. Inserra (QUB), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), D. Wright (QUB), K. Chambers, H. Flewelling, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat (IfA, Univ. Hawaii)
on 11 Oct 2015; 18:50 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (mf@ast.cam.ac.uk)

Subjects: Optical, Supernovae, Transient

PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org ), reports the following supernova classifications. Targets were supplied by Pan-STARRS Survey for Transients (see Huber et al., ATel #7153) and the MASTER Global Robotic Net (Lipunov et al., 2010, Adv. in Ast., 2010, 1) All observations were performed on the ESO New Technology Telescope at La Silla on 2015 Oct. 10, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) and GELATO (Harutyunyan et al., 2008, A&A, 488, 383). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).

 
Name                      | RA (J2000)  | Dec (J2000) | Disc. Date | Disc. Source | Disc Mag |  z     | Type | Phase | Notes
MASTERJ233328.09-015847.0 | 23:33:28.09 | -01:58:46.9 | 2015-10-05 | MASTER | 16.9 | 0.017 | II | ? | (1) PS15cej | 09:35:19.41 | +10:11:50.7 | 2015-10-02 | PSST | 18.1 | 0.049 | Ia | ~0d | PS15cgd | 23:32:49.56 | +08:06:56.8 | 2015-10-08 | PSST | 18.6 | 0.071 | ? | - | (2)

(1) The classification spectrum reveals broad Halpha, consistent with a Type II SN. The low S/N of the spectrum precludes determination of an accurate age.
(2) We see a blue spectrum, dominated by narrow Halpha, Hbeta, [Oiii]5007, [Oii] 3727 and [Sii] 6717,6731 emission lines. From SDSS images, it appears that the host is either an irregular galaxy, or is in the process of undergoing a merger. The transient appears to lie within a bright region offset from the (possible) main galaxy. The blue spectrum is suggestive of a young SN.