Electronic Telegram No. 3865
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 2014av IN UGC 4713 = PSN J09002002+5229280
     Zhijian Xu, Nanjing, Jiangsu, China; and Xing Gao, Urumqi, Xinjiang,
China, report the discovery of a possible supernova (mag approximately 16.2)
on several 40-s survey images (limiting mag about 19.0) taken by Xing Gao in
the course of the Xingming Sky Survey around Apr. 19.717 UT using a Celestron
C14 Schmidt-Cassegrain telescope at Mt. Nanshan.  The new object is located
approximately at R.A. = 9h00m20s.02, Decl. = +52d29'28".0 (equinox 2000.0),
which is about 2".7 west and 11".2 south of the center of UGC 4713.  Nothing
is visible at this position on a Digitized Sky Survey image from 1991 Feb. 9
(limiting mag about 19.5).  The images have been posted at the following
website URL:  http://www.xjltp.com/XOSS/XM67ZX/XM67ZX.htm.  The variable was
designated PSN J09002002+5229280 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2014av based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2014av:  2014
Mar. 22, [18.5 (Xu and Gao); 26, [19.0 (Xu and Gao); Apr. 16.84, 17.6 (F.
Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy; 0.5-m Newtonian telescope
+ FLI Proline 4710 camera in the course of the Italian Supernovae Search
Project; pre-discovery; limiting magnitude 19.5; position end figures 20s.4,
29".2; image posted at https://www.flickr.com/photos/snimages/13934647542/);
19.942, 16.5 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.60-m f/4.6
reflector; position end figures 19s.99, 27".9); 21.783, 16.1 (G. Masi, F.
Nocentini, and P. Schmeer; remotely using a 43-cm telescope near Ceccano,
Italy; position end figures 19s.99, 27".7); 24.640, 16.2 (Xu and Gao; image
posted at URL http://njzhijian.lamost.org/PSN%20J09002002+5229280-0424.jpg).

     J.-J. Zhang, Yunnan Astronimical Observatory (YNAO); and X.-F. Wang,
Tsinghua University, report on an optical spectrogram (range 350-890 nm) of
PSN J09002002+5229280 = SN 2014av that was obtained on Apr. 23.65 UT with the
2.4-m telescope (+ YFOSC) at the LiJiang Gaomeigu Station of YNAO.  The
spectrum is blue and shows P-Cyg profiles of He I lines, with the FWHM
velocity of He I 587.6-nm being estimated as about 1500 km/s.  The strong
emission feature at 385.0-400.0 nm might be attributed to the blend of He I,
Mg II, and Ca II lines.  A comparison with the spectra of other supernovae
shows that of 2014av to be very similar to a transitional type-Ibn supernova
such as 2006jc (Pastorello et al. 2007, Nature 389, 131).


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

                         (C) Copyright 2014 CBAT
2014 May 7                       (CBET 3865)              Daniel W. E. Green