[IAUC] CBET 3620: 20130804 : SUPERNOVA 2013es = PSN J14105017+5525240

Dom Ago 4 11:47:22 ART 2013

                                                  Electronic Telegram No. 3620
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 2013es = PSN J14105017+5525240
     Zhijian Xu (Nanjing, Jiangsu, China) and Xing Gao (Urumqi, Xinjiang,
China) report the discovery of an apparent supernova (mag approximately 18.0)
on an unfiltered 40-s survey CCD image (limiting mag about 18.5) taken by Xing
Gao in the course of the Xingming Sky Survey around Aug. 1.667 UT using a
0.36-m f/6.9 Celestron C14 Schmidt-Cassegrain telescope located at Mt. Nanshan.
The new object is approximately located at R.A. = 14h10m50s.17, Decl. =
+55d25'24".0 (equinox 2000.0), which is about 1".6 west and 14".9 south of the
center of the presumed host galaxy.  Nothing is visible at this position on a
Digitized Sky Survey image from 1996 June 8 (limiting mag about 19.7).  Their
images are posted at website URL http://www.xjltp.com/XOSS/XM58ZX/XM58ZX.htm.
The variable was designated PSN J14105017+5525240 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013es based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013es:  2013 June 24 and 25, [18.0 (Gao); Aug. 1.972, 18.4 (G. Masi and F.
Nocentini, remotely using a 43-cm robotic telescope at Ceccano, Italy; position
end figures 50s.00, 24".2); 2.260, 18.1 (J. Brimacombe, Cairns, Australia;
remotely with a 51-cm telescope + luminance filter at the New Mexico Skies
observatory near Mayhill, NM, U.S.A.; position end figures 50s.05, 24".6;
image posted at URL http://www.flickr.com/photos/43846774@N02/9433448377/);
2.886, R = 17.5 (Joel Nicolas, Vallauris, France; 0.41-m f/3.3 reflector;
position end figures 50s.02, 24".2); 3.910, 19.0 (F. Luppi and L. Buzzi,
Varese, Italy; 0.36-m reflector; position end figures 50s.00, 24".3; image
posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_14105017+5525240.jpg).

     L. Tomasella, S. Benetti, E. Cappellaro, P. Ochner, A. Pastorello, and
M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that a spectrogram (range 340-820 nm; resolution 1.3 nm)
of PSN J14105017+5525240 = 2013es, obtained on Aug. 1.84 UT with the Asiago
1.82-m Copernico Telescope (+ AFOSC), shows that the object is a type-II
supernova a few days after explosion.  Broad and shallow P-Cyg lines of
H-alpha, H-beta, and He I 587.6-nm are clearly detected.  Adopting for the
host galaxy a redshift z = 0.0429 (Sloan Digital Sky Survey, via NED), a
good fit is found with the type-IIP supernova 1999gi (Leonard et al. 2002,
A.J. 124, 2490) a few days after explosion.  The Asiago classification
spectra are posted at website URL http://graspa.oapd.inaf.it.  Classification
was made via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID
(Blondin and Tonry 2007, Ap.J. 666, 1024).


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

                         (C) Copyright 2013 CBAT
2013 August 4                    (CBET 3620)              Daniel W. E. Green