ePESSTO spectroscopic classification of optical transients

ATel #11965; Z. Kostrzewa-Rutkowska (SRON/RU), E. Callis (UCD), M. Fraser (UCD), J. Anderson (ESO), L. Galbany (U. Pitt) C. Inserra (Southampton), E. Kankare (QUB), K. Maguire (QUB), S. J. Smartt (QUB), O. Yaron (Weizmann), D. R. Young (QUB), I. Manulis (Weizmann), J. Tonry, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST) A. Rest (STScI), K. W. Smith, O. McBrien (QUB), D. E. Wright (Univ. of Minnesota)
on 17 Aug 2018; 22:51 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (morgan.fraser@ucd.ie)

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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 following supernova classifications. Targets were supplied by the ATLAS survey, see Tonry et al. (2011, PASP, 123, 58) and Tonry et al. (ATel #8680); the All Sky Automated Survey for SuperNovae ASAS-SN (see Shappee et al. 2014, ApJ, 788, 48 and http://www.astronomy.ohio-state.edu/~assassin/index.shtml ); and the ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 August 16, 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 and additional details can be obtained from http://www.pessto.org (via WISeREP) and the IAU Transient Name Server.

 
Survey Name | IAU Name  | RA (J2000) | Dec (J2000) | Disc. Date | Source | Disc Mag | z     | Type | Phase | Notes 
ASASSN-18sf | AT2018fcv | 03:36:05.2 | -26:36:28.6 | 20180815   | ASASSN | 18.5     | ?     | ?    | ?     | (1) 
ASASSN-18sc | AT2018fci | 18:24:27.1 | -58:45:08.6 | 20180813   | ASASSN | 17.5     | 0.070 | AGN  | -     | 
ATLAS18tuw  | AT2018fds | 03:01:18.7 | -37:04:12.7 | 20180813   | ATLAS  | 18.6     | ?     | ?    | ?     | (2) 
Gaia18cec   | SN2018fca | 01:38:41.5 | -50:24:05.4 | 20180812   | Gaia   | 17.5     | 0.05  | Ia   | +3d   | 

(1) Target not visible in acquisition image.
(2) The spectrum is blue and largely featureless, with a weak narrow emission feature at ~4690 Ang, possibly on top of a broader (~100 Ang) bump. A second narrow, weak feature also appears to be present at 4155 Ang. We note that the ~4690 Ang feature is close to the rest wavelength of HeII, raising the possibility that this is a foreground Galactic transient.