Electronic Telegram No. 3889
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2014bf IN MCG +03-41-7 = PSN J15573523+1801476
     J. Mo, W.-x. Li, L.-y. Li, and X.-f. Wang, Tsinghua University (THU); and
T.-m. Zhang, National Astronomical Observatories of China (NAOC), report the
discovery of an apparent supernova (mag 17.4) on unfiltered CCD images taken
on May 22.72 UT using the 0.6-m NAOC Schmidt telescope in the course of the
THU-NAOC Transient Survey (TNTS).  The object is located at R.A.
= 15h57m35s.23, Decl. = +18d01'47".6 (equinox 2000.0), which is 0".3 east and
6".2 north of the center of the galaxy MCG +03-41-7.  Nothing is visible at
this position on archival images obtained on 2013 Mar. 23 (limiting mag about
20.0) or on an image from the Palomar Sky Survey.  The TNTS images are posted
at URL http://www.thca.tsinghua.edu.cn/~wangxf/TNTS/PSNJ15573523+1801476.png.
The variable was designated PSN J15573523+1801476 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2014bf based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2014bf:  May 25.424, 17.2 (J. Brimacombe, Cairns, Australia; remotely using a
43-cm CDK telescope + STL-6303 camera at the New Mexico Skies observatory
near Mayhill, NM, U.S.A.; position end figures 35s.27, 46".0; image posted at
website URL https://www.flickr.com/photos/43846774@N02/14084280899/); 29.927,
17.5 (G. Masi; remotely using a 43-cm telescope near Ceccano, Italy; position
end figures 35s.25, 47".1).

     J.-j. Zhang, Yunnan Observatories (YNAO); and X.-f. Wang, Tsinghua
University, report on an optical spectrogram (range 340-890 nm) of SN 2014bf
that was obtained on May 24.81 UT with the 2.4-m telescope (+ YFOSC) at the
LiJiang Gaomeigu Station of YNAO.  The spectrum is blue and consistent with a
type-IIP supernova at around maximum light.  Cross-correlation with a library
of supernova spectra using the "Supernova Identification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) shows that 2014bf matches with SN 2005cs at
-1 day.  Adopting a redshift of 0.0130 for the host galaxy (MCG +03-41-7)
from the narrow emission line, they measure an H-alpha P-Cyg absorption
minimum velocity of about 10800 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 June 9                      (CBET 3889)              Daniel W. E. Green