[IAUC] CBET 3645: 20130902 : SUPERNOVA 2013fd IN ESO 353-G14 = PSN J01340066-3423404

Dom Sep 1 19:58:47 ART 2013

                                                  Electronic Telegram No. 3645
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 2013fd IN ESO 353-G14 = PSN J01340066-3423404
     Stuart Parker, Canterbury, New Zealand, reports the discovery of an
apparent supernova (red mag 18.5) on a 30-s unfiltered CCD image (limiting mag
19.0) taken on Aug. 27.561 UT with a 35-cm Celestron C14 f/6.3 reflector (+
ST10 camera) at his Parkdale Observatory in the course of the Backyard
Observatory Supernova Search.  The new object is located at R.A. =
1h34m00s.66, Decl. = -34d23'40".4 (equinox 2000.0; reference stars from USNO-B
and UCAC4 catalogues), which is 5" east and 25" south of the nucleus of the
galaxy ESO 353-G14.  Nothing is visible at this position on Digitized Sky
Survey red and infrared images (limiting red magnitude > 19).  Parker has made
his image of the variable viewable at website URL http://tinyurl.com/k58z786.
The variable was designated PSN J01340066-3423404 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013fd based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013fd:  Aug. 30.765, 16.7 (J. Brimacombe, Cairns, Australia; 41-cm telescope
+ infrared filter; bandpass > 700 nm; position end figures 00s.67, 40".5;
image posted at URL http://www.flickr.com/photos/43846774@N02/9633161646/);
31.415, 16.7 (L. Elenin, Lyubertsy, Russia, and I. Molotov, Moscow, Russia;
remotely taken with a 0.45-m f/2.8 telescope at the ISON-NM Observatory near
Mayhill, NM, USA; limiting mag about 19.2; position end figures 00s.70 +/-
0".1, 40".4 +/- 0".1; UCAC-4 reference stars; image posted at website URL
http://spaceobs.org/images/TOCP/PSNJ01340066-3423404-20130831.png).

     N. Morrell, Las Campanas Observatory, Carnegie Supernova Project; and
J. L. Prieto, Princeton University, report that on Aug. 30.20 UT they obtained
an optical spectrogram (range 365-950 nm) of PSN J01340066-3423404 = SN 2013fd
with the Las Campanas 2.5-m du Pont telescope (+ WFCCD) that consists of a
blue continuum with superimposed broad P-Cyg profiles of Balmer and He I
lines, charcteristic of a young type-II supernova.  After correcting for the
host-galaxy recession velocity of 3809 km/s (Mathewson et al. 1992, Ap.J.
Suppl. 81, 413; via NED) the minimum of the H-beta P Cyg absorpion is
blueshifted by roughly 8500 km/s.  The spectrum also exhibits strong nebular
emission from a surrounding H II region and interstellar Na I absorption
(equivalent width 0.15 nm) at the redshift of the host galaxy.  Comparison
with a library of supernova spectra thorugh the Supernova Identification tool
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) gives good matches with a
number of type-IIp events within a few days from maximum light, including
SN 2006bp at +3 days and SN 2004et at -3 days as among the most similar.


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

                         (C) Copyright 2013 CBAT
2013 September 2                 (CBET 3645)              Daniel W. E. Green