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ePESSTO spectroscopic classification of optical transients

ATel #11271; R. Cartier (CTIO), A. Razza (U. de Chile/ESO), P. Clark (QUB), O. McBrien (QUB), E. Kankare (QUB), T.-W. Chen (MPE), M. Dennefeld (IAP and Sorbonne Universite), C. Inserra (Southampton), K. Maguire (QUB), S. J. Smartt (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), I. Manulis (Weizmann), L. Wyrzykowski (Warsaw Observatory, Poland), J. Anderson (ESO Chile)
on 7 Feb 2018; 16:38 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Erkki Kankare (e.kankare@qub.ac.uk)

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 following supernova classifications. Targets are from the OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ ) and 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 ). All observations were performed on the ESO New Technology Telescope at La Silla on 2018 Feb 6, 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 
OGLE18ht    | SN2018ht | 05 02 14.48 | -61 54 24.8  |  20180115  | OGLE    | 19.03    | 0.109  | II   | > +20 d   | (1) 
ASASSN-18bu | SN2018pg | 05 07 01.12 | -32 41 06.1  |  20180203  | ASAS-SN | 18.10    | 0.067  | Ia   | +4 to +7  | (2) 

(1) SN2018ht was observed as part of the GREAT survey (Chen et al. ATel #10510), having a black body temperature of T_BB > 7000 K obtained from the photometry taken on 2018 January 31 with griz=19.84,19.61,19.56,19.63 mag using GROND zero points. Redshift determined from host galaxy lines. Photometry from the OGLE survey suggest a long rise time of >40 days with a peak around 20 days ago. The determined redshift implies a SN absolute magnitude of brighter than -19. Both of these observations suggest an unusual type II SN.
(2) Redshift from host galaxy.