[IAUC] CBET 4167: 20151115 : SUPERNOVA 2015V IN UGC 11000 = PSN J17492705+3608360

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 4167
Central Bureau for Astronomical Telegrams
Mailing address:  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 2015V IN UGC 11000 = PSN J17492705+3608360
     Further to CBET 4049, G. Halevi, W. Zheng, and A. V. Filippenko,
University of California at Berkeley, report the LOSS discovery of a supernova
in UGC 11000 on unfiltered KAIT images:

 SN       2015 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2015V    Apr. 4.516  17 49 27.05  +36 08 36.0   15.9    4".6 E, 6".7 S

A finding chart was posted by the discoverers at the following website URL:
http://astro.berkeley.edu/~zwk/findingchart/PSN_J17492705+36083599.jpg.  The
variable was designated PSN J17492705+3608360 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2015V based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2015V:  Mar. 27, [18.5 (KAIT); Apr. 7.056 UT, 15.5 (G. Masi; remotely using a
43-cm telescope at Ceccano, Italy; position end figures 27s.00, 36".3).

     J. Zhang, Yunnan Observatories; and X.-f. Wang, Tsinghua University,
report on an optical spectrogram (range 350-910 nm) of PSN J17492705+3608360
= SN 2015V that was obtained on Apr. 7.8 UT with the 2.4-m telescope (+ YFOSC)
at the LiJiang Gaomeigu Station of Yunnan Observatory.  The spectrum is
consistent with a type-II-P supernova at a relatively early phase, showing a
blue continuum and very broad P-Cyg profiles of H and He lines.  Cross-
correlation with a library of supernova spectra using the comparison tool
"Gelato" (Harutyunyan et al. 2008, A.Ap. 488, 383) shows that 2015V matches
with SN 1999gi at 6.8 days after explosion.  After removing a recession
velocity of 1369 km/s for its host galaxy, UGC 11000 (Springob et al. 2005,
Ap.J. Suppl. 160, 149), the observers measure an expansion velocity of about
12000 km/s from the absorption minimum of H-alpha.

     W. Zheng, I. Shivvers, H. Yuk, K. Clubb, and V. Filippenko, University
of California, Berkeley, report that a CCD spectrogram (range 350-1000 nm)
of PSN J17492705+3608360 = SN 2015V was obtained on Apr. 16.457 UT with the
Shane 3-m reflector (+ Kast spectrograph) at Lick Observatory.  The spectrum
shows that 2015V is a type-IIP supernova.  Cross-correlation with a library
of supernova spectra using the "SuperNova Identification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) indicates a similarity with several type-IIP
supernovae about one week after maximum brightness.  The redshift derived
from SNID is z = 0.005, consistent with the redshift of the putative host
galaxy, UGC 11000, with z = 0.0046 as given in SIMBAD.


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 4167)              Daniel W. E. Green