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Spectroscopic classification of three optical transients

ATel #10758; Subhash Bose, Subo Dong, Ping Chen (KIAA-PKU), Jose L. Prieto (UDP)
on 19 Sep 2017; 12:45 UT
Credential Certification: Subhash Bose (bose@pku.edu.cn)

Subjects: Optical, Supernovae

We report optical spectroscopic observations of optical transients 2017ghu, 2017grn and MASTER OT J192441.01+620639.4 (ATel #10730) done on UT 2017-09-16, with DBSP mounted on the Hale 5m telescope at Palomar Observatory. Targets were discovered by Puckett Observatory Supernova Search (POSS; http://www.cometwatch.com/supernovasearch.html ) and MASTER-Kislovodsk auto-detection system (Lipunov et al. 2010). We used SNID (Blondin & Tonry, 2007, ApJ, 666, 1024) to identify the types and phases of the SNe from spectra.

 IAU / Survey Name   | Obsv. Date    | Spec. Type | Phase             |  Redshift    | Notes  
 SN 2017ghu          | 2017-09-16.44 |    Ia      | ~30 days post max.|  0.018 (NED) |  (1)   
 SN 2017grn          | 2017-09-16.29 |    II      |  ---              |  0.018 (NED) |  (2)  
 J192441.01+620639.4 | 2017-09-16.28 |    CV      |  ---              |  0.0         |  

(1) The age of the SN Ia is about a month after maximum. The SNID estimated redshift is consistent with the redshift of the host UGC 3329.
(2) The spectrum shows overall blue continuum, with broad bumps of hydrogen Balmer and He I (5876 Angstroms), resembling young type II SN.

This research uses data obtained through the Telescope Access Program (TAP), which has been funded by the National Astronomical Observatories of China, the Chinese Academy of Sciences, and the Special Fund for Astronomy from the Ministry of Finance. Observations obtained with the Hale Telescope at Palomar Observatory were obtained as part of an agreement between the National Astronomical Observatories, Chinese Academy of Sciences, and the California Institute of Technology.