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PESSTO spectroscopic classification of optical transient

ATel #8018; T. Moraga, L. Galbany(DAS, MAS) , C. Romero-Canizales(PUC, MAS), T. de Jaeger (DAS, MAS), F. Forster (CMM, MAS), J. Anderson (ESO), M. Fraser (University of Cambridge), C. Inserra (QUB), K. Maguire (ESO), S. J. Smartt (QUB), K. W. Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young (QUB), Often, Ilan Manulis (Weizmann), D. Wright (QUB), K. Chambers, H. Flewelling, M. Huber, E. Magnier, J. Tonry, C. Waters, R. J. Wainscoat (IfA, Univ. Hawaii), L. Wyrzykowski (Warsaw Observatory, Poland)
on 8 Sep 2015; 19:54 UT
Credential Certification: Thomas de Jaeger (dejaeger.thomas@gmail.com)

Subjects: Optical, Supernovae

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 "OGLE-IV Real-time Transient Search (Wyrzykowski et al., 2014 arxiv:1409.1095; http://ogle.astrouw.edu.pl/ )" and by Pan-STARRS Survey for Transients (see Huber et al., ATel #7153). All observations were performed on the ESO New Technology Telescope at La Silla on 2015 September 7th, 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
PS15bvx | 21 47 15.67 | +07 49 47.4 | 20150905 | Pan-STARRS | 18.97 | 0.077 | Ia-norm | +11 to +20 | OGLE15gb | 00 31 45.58 | -64 34 15.9 | 20141014 | OGLE | 21 | unknown | unknown | unknown | (1) OGLE15fy | 02 52 49.60 | -73 53 13.4 | 20150829 | OGLE | 20 | 0.12 | Ia-norm | Around maximum | PS15bvb | 03 37 18.46 | -05 02 10.2 | 20150830 | Pan-STARRS | 18.2 | 0.022 | Ib/IIb | >90 | (2) OGLE15et | 02:09:25.28 | -70 34 07.8 | 20150815 | OGLE | 17.8 | 0.064 | Ia-91T | >20 | OGLE15eo | 03 02 15.55 | -74 17 12.2 | 20150816 | OGLE | 20.5 | 0.05 | Ic |~10 days after maximum | (3)
(1) 2100 sec exposure did not give a spectrum with enough S/N to obtain any good spectral fit. We see an feature around 5200 A

(2) The best match is to SN2008D at a late phase. This could be an old Ib or IIb.

(3) In a previous ATEL #8005, we reported a classification for OGLE15eo as a SN Ia. New spectrum with increased exposure time is best fitted by SN 2004aw, thus we report a SN Ic classification.