Spectroscopic Classifications of Two Optical Transients

ATel #10681; Liming Rui, Xiaofeng Wang, Danfeng Xiang, Han Lin (Tsinghua University), Huijuan Wang (NAOC), Vladimir Lipunov (Lomonosov MSU, on behalf of MASTER), Zhijian Xu, Bin Li, Hanjie Tan, Haibin Zhao (PMO), Lifan Wang (PMO/TAMU), Jujia Zhang (YNAO), and Tianmeng Zhang (NAOC)
on 30 Aug 2017; 12:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Xiaofeng Wang (wang_xf@mail.tsinghua.edu.cn)

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On Aug.29, 2017, we obtained spectra of two transients, AT2017giq and MASTER OT J033744.97+723159.0, with the Xinglong 2.16-m telescope of National Astronomical Observatories of China (NAOC). We classify them as Type IIb Supernova and Type Ic Supernova, respectively, by cross-correlating with a library of supernova spectra using the "Supernova Identification" code (Blondin & Tonry, 2007, ApJ, 666, 1024). Details of our identifications are reported as below:

IAU Name | Survey Name | Discovery Date (UT) | Redshift | Type | Phase | Notes
SN 2017giq | PTSS-17vkg | 2017-08-27.64 | 0.030 | Ic | +5d | (1)
MASTER OT J033744.97+723159.0| MASTER | 2017-08-27.84 | 0.0073 | IIb | -2d | (2)

(1) Consistent with the classfication reported in ATEL #10680.
(2) An ejecta velocity of about 14800 km/s can be inferred from Si II 635.5nm absorption.