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ePESSTO spectroscopic classification of optical transients

ATel #11556; K. E. Heintz (Univ. Iceland, DAWN), D. Malesani (DAWN, DARK), P. D'Avanzo (INAF-OAB), G. Leloudas (DARK), C. Barbarino (Stockholm), T. W. Chen (MPE), Z. Kostrzewa-Rutkowska (SRON/RU), C. Inserra (Southampton), E. Kankare, K. Maguire, S. J. Smartt (QUB), O. Yaron (Weizmann), D. Young (QUB), I Manulis (Weizmann).
on 21 Apr 2018; 19:14 UT
Credential Certification: Paolo D'Avanzo (paolo.davanzo@brera.inaf.it)

Subjects: Optical, Supernovae, Transient

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 ESA Gaia Photometric Science Alerts Team and DPAC (http://gsaweb.ast.cam.ac.uk/alerts), 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 April 20 UT, 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. Unless otherwise noted the redshift is from SN template matching.

 
Survey Name | IAU Name   | RA (J2000)  | Dec (J2000)  | Disc. Date | Source      | Disc Mag.| z     | Type   | Phase    | Notes 
Gaia18awh   | SN 2018asj | 09 22 58.75 | +09 04 10.7  | 2018 04 05 | Gaia        | 18.9     | 0.10  | Ia     |+1-2 weeks| (1) 
            | SN 2018atq | 11 47 04.12 | +19 33 02.8  | 2018 04 11 | TNTS        | 18.3     | 0.17  | IIn    |> +20     | (2) 
Gaia18aza   | SN 2018avu | 10 40 15.59 | +01 53 17.5  | 2018 04 15 | Gaia        | 18.8     | 0.08  | Ia     |+4 to +7  | (3) 
ASASSN-18io | SN 2018awn | 11 30 11.62 | +04 24 55.5  | 2018 04 20 | ASAS-SN     | 16.9     | 0.029 | Ia     |-7 to -4  | (4) 
Gaia18azt   | SN 2018awp | 00 16 14.08 | -31 37 02.8  | 2018 04 19 | Gaia        | 17.1     | 0.070 | IIn    |> +20     | (5) 

(1) Consistent with Type 91T or 99a-like; Gaia18awh was observed as part of the GREAT survey (Chen et al. ATel #10510), having a black body temperature of T_BB ~ 13300 +/- 4450 K obtained from the photometry taken on April 18, 2018 with griz = 18.99, 18.94, 19.54, 20.09 mag.
(2) SDSS host galaxy photo_z = 0.163+/-0.033.
(3) SDSS host galaxy photo_z = 0.118+/-0.033.
(4) spectroscopic redshift from SDSS; possible Type 91T-like (see ATel #11555).
(5) Strong emission from H-alpha and H-beta. No strong [O III], and so likely Balmer emission from SN. Absolute mag is M ~ -20. Possible Ia + CSM, or Ic + CSM, and phase uncertain since no Gaia lightcurve; redshift from host galaxy.