PESSTO spectroscopic classification of optical transients

ATel #10204; F. Onori (SRON), A. Hamanowicz (Warsaw), M. Fraser (UCD), J. Anderson (ESO), S. Mattila (Turku) C. Inserra (Southampton), E. Kankare (QUB), I. Manulis (Weizmann), K. Maguire (QUB), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (UC Davis), O. Yaron (Weizmann), D. Young (QUB), J. Tonry, B. Stalder, L. Denneau., A. Heinze, H. Weiland (IfA, Univ. of Hawaii), A. Rest (STScI)
on 24 Mar 2017; 13:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Morgan Fraser (morgan.fraser@ucd.ie)

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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 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 ), the IAU TNS list (see https://wis-tns.weizmann.ac.il/), the ATLAS survey (see Tonry et al., 2011, PASP, 123, 58) and from the SUNBIRD survey. All observations were performed on the ESO New Technology Telescope at La Silla on 2017 March 23, 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 
AT2017cjb   | SN2017cjb | 12:53:50.44 | +09:42:17.7 | 20170323   | TNS     | 15.9     | 0.009 | II   | -10d  | (1) 
ASASSN-17dw | SN2017cjc | 20:29:49.39 | -42:43:00.0 | 20170323   | ASASSN  | 16.8     | 0.04  | Ia   | 0d    |   
ATLAS17dbm  | SN2017cjd | 11:50:30.16 | -18:35:44.9 | 20170319   | ATLAS   | 18.5     | 0.023 | Ic   | 0d    | (2) 
AT2017chi   | AT2017chi | 13:52:16.09 | +02:06:03.9 | 20170313   | SUNBIRD | 17.9 (K) | 0.033 | ?    | ?     | (3) 

(1) The spectrum is blue, and shows weak broad Balmer lines consistent with a Type II SN a few days after explosion. Gr11+16 used for this classification
(2) Redshift from narrow galaxy lines.
(3) Narrow, Halpha, Hbeta and [S II] 6717,6730 emission, and strong narrow NaD absorption, on a flat continuum. The candidate was discovered in the NIR with adaptive optics imaging, and we see no clear optical counterpart in the acquisition image for our classification spectrum.