POSSIBLE SUPERNOVA IN an Anonymous Galaxy
Zhijian Xu(Nanjing,Jiangsu,China) and Xing Gao (Urumqi,Xinjiang,China), report the discovery of a possible supernova (mag approximately 18.0) on a 40-s survey image (limiting mag about 18.5) taken by Xing Gao in Xingming Observation Sky Survey(C42) around Aug.01.66671 UT.using an unfiltered CCD ( + Celestron C14 Schmidt-Cassegrain telescope D=356-mm @f/6.9 ). The new object approximately located at R.A.=14h 10m 50s.17 Decl.=+55°25’24”.0(equinox 2000.0). Which is about 1.6″ west and 14.9″ south of the center of the host galaxy. Nothing is visible at this position on archival images taken on Jun.25(limiting mag 18.0),Jun.24(limiting mag 18.0) or on the DSS from Jun.08,1996(limiting mag about 19.7).
NET USNO-A2.0
XM58ZX C2013 08 01.66671 14 10 50.17 +55 25 24.0 18.0 V C42
All images can be seen from: http://www.xjltp.com/XOSS/XM58ZX/XM58ZX.htm
C42,Xingming Observatory,Mt. Nanshan. Observers Z.Xu,X.Gao,Measurers Z.Xu 0.36-m f/6.9 Schmidt-Cassegrain telescope and CCD.
CBET 3620
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@eps.harvard.edu (alternate cbat@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