Electronic Telegram No. 4192
Central Bureau for Astronomical Telegrams
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SUPERNOVA 2015aq IN UGC 5015 = PSN J09254453+3416361
     Vladimir Lipunov and Vladislav Shumkov report the discovery of an
apparent supernova (mag 15.6) on two unfiltered CCD images (limiting mag 17.9)
taken on Sept. 21.072 UT with the twin 0.40-m f/2.5 MASTER-Kislovodsk
reflector in the course of their automated survey.  The new variable is
located at R.A. = 9h25m44s.53, Decl. = +34d16'36".1 (equinox J2000.0), which
is 42".8 west and 1".5 south of the center of the galaxy UGC 5015.
E. Gorbovskoy, A. Tlatov, and N. Tiurina add that nothing is visible at
this position MASTER-Kislovodsk images obtained on 2014 Dec. 21.097 (limiting
mag 20.2).  The discovery and reference images have been posted at website
URL http://master.sai.msu.ru/static/OT/MASTEROTJ092544.53341636.1.png.  The
variable was designated PSN J09254453+3416361 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2015aq based on the
spectroscopic confirmation reported below.  N. James, Chelmsford, Essex,
England, writes that he confirmed the presence of 2015aq on a CCD image
taken on Sept. 25.194 with a Celestron 11 telescope, measuring red mag 15.4
and position end figures 44s.55, 35".6.

     T. Nakaoka, K. Shiki, K. S. Kawabata, K. Takaki, and M. Kawabata,
Hiroshima University; and M. Yamanaka, Konan University, obtained a
low-resolution optical spectrum (range 450-900 nm) of PSN J09254453+3416361 =
SN 2015aq on Sept. 21.7 UT with the 1.5-m Kanata telescope (+ HOWPol) at the
Higashi-Hiroshima Observatory.  The spectrum shows a P-Cyg profile of the
H-alpha line and the Ca II infrared triplet, suggesting that this is a
type-II supernova.  The absorption component of the H-alpha line is
blueshifted by around 8800 km/s.  A comparison with a library of supernova
spectra using GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) reveals that
the spectrum gives a good match to type-IIP supernovae -- e.g., SNe 1992H and
2004et at a month after their explosions.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 November 19                 (CBET 4192)              Daniel W. E. Green