Electronic Telegram No. 3819
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 2014W = PSN J11544229+4401181
     G. Dhungana, Southern Methodist University; J. M. Silverman, University
of Texas at Austin; R. Kehoe, Southern Methodist University; W. Zheng,
University of California at Berkeley; J. Vinko, University of Szeged; F. V.
Ferrante, Southern Methodist University; J. C. Wheeler and G. H. Marion,
University of Texas at Austin; and R. Quimby, Kavli IPMU, University of Tokyo,
on behalf of the ROTSE collaboration, report the discovery of a new supernova
(mag about 17.5) in unfiltered images taken on Jan. 25.25 UT with the 0.45-m
ROTSE-IIIb telescope at McDonald Observatory in Texas.  The new object is
located at R.A = 11h54m42s.29, Decl. = +44o01'18".1 (equinox 2000.0;
uncertainty about 1") and appears to be associated with the galaxy SDSS
J115442.19+440117.7.  A finding chart has been posted at the following website
URL: http://www.rotse.net/rsvp/j115442+440118/ROTSE3J115442+440118.jpg.
The variable was designated PSN J11544229+4401181 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2014W based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2014W:  Feb. 2.916, 16.4 (Denis Buczynski, Portmahomack, U.K.; Celestron C14
reflector + SBIG ST9XE camera; position end figures 42s.25, 17".9; UCAC-4
reference stars).

     J. M. Silverman and J. C. Wheeler, University of Texas; Y. Cao, California
Institute of Technology; S. Tang, California Institute of Technology and
University of California at Santa Barbara; and A. De Cia, Weizmann Institute
for Science, report that inspection of a CCD spectrogram (range 500-1000 nm),
obtained on Mar. 1 UT with the 10-m Keck II telescope (+ DEIMOS), shows that
PSN J11544229+4401181 = SN 2014W is a type-Ia supernova.  The host-galaxy
recession velocity is found to be 10890 km/s from narrow emission features.
Cross-correlation with a library of supernovae spectra using the "SuperNova
IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates
that the object is a normal type-Ia supernova roughly 2-3 weeks past maximum
brightness.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 March 10                    (CBET 3819)              Daniel W. E. Green