TITLE:   GCN CIRCULAR
NUMBER:  20716
SUBJECT: LIGO/Virgo G274296: Kanata 1.5m optical spectroscopy of MASTER optical transient
DATE:    17/02/22 00:37:01 GMT
FROM:    Michitoshi Yoshida at J-GEM  <yoshidam@hiroshima-u.ac.jp>

T. Nakaoka, T. Abe, M. Chogi, M. Yoshida, Y. Utsumi and K. S.
Kaawbata (Hiroshima University) on behalfof J-GEM collaboration,

We performed optical spectroscopy of the optical transient MASTER
OT J105519.53+365834.1PSN in PGC 032819 (Lipunov et al. GCN 20712)
with 1.5-m Kanata telescope at Higashi-Hiroshima Observatory on
2017 Feb 21. The spectrum shows a broad absorption line around
620 nm. The overall features suggest that this PSN is a SN 1991T
like bright Type Ia supernova around maximum brightness. A
comparison with a library of supernova spectra using GELATO
(Harutyunyan et al. 2008, A.Ap. 488, 383) suggests that the
spectrum gives a good match to SN 1998es at -3.5 days before
B-band maximum.