Electronic Telegram No. 4172
Central Bureau for Astronomical Telegrams
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SUPERNOVA 2015aa
     Tomoki Morokuma, Institute of Astronomy, University of Tokyo; Nozomu
Tominaga, Konan University; Masaomi Tanaka, National Astronomical
Observatory of Japan; Ji-an Jiang, Institute of Astronomy, University of
Tokyo; Takumi Shibata, Konan University; and Masanori Takeishi, Hokkaido,
Japan, on behalf of the Kiso Supernova Survey (KISS) collaboration, report
the discovery of an apparent supernova (mag 20.6) on a g-band CCD image
(limiting mag 21.2) taken on May 19.60 UT with the Kiso Wide Field Camera
(field-of-view 2.1 deg x 2.1 deg) on the 1.05-m Kiso Schmidt telescope.  The
new object is located at R.A. = 13h12m53s.70, Decl. = +28d47'55".3 (equinox
2000.0), which is 1.7" east and 0.3" south of a possible host galaxy, SDSS
J131253.56+284755.5.

     Tomoki Morokuma, Mitsuru Kokubo, Yasuhito Hashiba, Kazuma Mitsuda, Mamoru
Doi, Shigeyuki Sako, Yuki Kikuchi, Hidenori Takahashi, and Ken Tateuchi,
Institute of Astronomy, University of Tokyo; Hanindyo Kuncarayakti, Millennium
Institute of Astrophysics, Chile; Makoto Watanabe, Hikaru Nakao Hokkaido
University; and Yoichi Itoh, Kumiko Morihana, Satoshi Honda, Yuhei Takagi, and
Jun Takahashi, University of Hyogo, report that a optical low-resolution (R
about 100) spectrogram of SN 2015aa was obtained on May 21 UT with the Line
Imager and Slit Spectrograph (LISS; Hashiba et al. 2014, SPIE 9147, 2) on the
2.0-m Nayuta telescope at the Nishi-Harima Observatory.  Cross-correlation
with a library of supernova spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows good matches with normal
type-Ia supernovae around maximum at a redshift of about 0.18.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 November 15                 (CBET 4172)              Daniel W. E. Green