[IAUC] CBET 4049: 20150123 : SUPERNOVA 2015C IN IC 4221 = PSN J13183047-1436446

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                                                  Electronic Telegram No. 4049
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2015C IN IC 4221 = PSN J13183047-1436446
     Further to CBET 4026, K. Pina, W. Zheng, and A. V. Filippenko,
University of California at Berkeley, report the LOSS discovery of an apparent
supernova in IC 4221 on unfiltered KAIT images:

 SN       2015 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2015C    Jan. 7.604   13 18 30.47  -14 36 44.6   16.4    1".6 E, 12".5 S

The object was detected again on Jan. 11.54 UT at similar magnitude (16.4).
A finding chart has been posted by the discoverers at the following website
URL:  http://astro.berkeley.edu/~zwk/findingchart/PSN_J13183047-14364457.jpg.
The variable was designated PSN J13183047-1436446 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2015C based on the
spectroscopic confirmation reported below.  The type-Ia supernova 2002bs
(cf. IAUC 7861) also appeared in IC 4221.

     J. M. Silverman, University of Texas at Austin; G. Hosseinzadeh, Las
Cumbres Observatory Global Telescope (LCOGT); J. C. Wheeler and G. H. Marion,
University of Texas at Austin; S. Valenti, I. Arcavi, D. A. Howell, and C.
McCully, LCOGT; and J. Vinko, University of Szeged, report that a spectrogram
(range 320-1000 nm), obtained on Jan. 15.54 UT with the robotic FLOYDS
instrument mounted on the Faulkes Telescope North, shows that PSN
J13183047-1436446 = SN 2015C is a type-II supernova.  Correlation with a
library of supernova spectra using the "SuperNova IDentification" code (SNID;
Blondin and Tonry 2007, Ap.J. 666, 1024) indicates that 2015C is a normal
type-IIP supernova at 1-2 months after explosion.  After removal of the
host-galaxy recession velocity of 2889 km/s (Catinella et al. 2005, A.J. 130,
1037), the absorption minimum of the H-alpha line is found to be blueshifted
by about 5900 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 January 23                  (CBET 4049)              Daniel W. E. Green