[IAUC] CBET 3651: 20130913 : SUPERNOVA 2013fh IN ESO 550-G26 = PSN J04213820-1755414

Jue Sep 12 20:33:40 ART 2013

                                                  Electronic Telegram No. 3651
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 2013fh IN ESO 550-G26 = PSN J04213820-1755414
     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) taken by himself on Aug. 30.662 UT with a 30-cm Astro-Tech AT12RC
Ritchey-Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the
course of the Backyard Observatory Supernova Search.  The new object is
located at R.A. = 4h21m38s.20, Decl. = -17d55'41".4 (equinox 2000.0; reference
stars from USNO-B and UCAC4 catalogues), which is 21" east and 2" north of the
nucleus of the galaxy ESO 550-G26.  Nothing is visible at this position on
Digitized Sky Survey red and infrared images (limiting red magnitude > 19).
An image of the new object was posted by Parker at http://tinyurl.com/l9bu3mo.
The variable was designated PSN J04213820-1755414 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013fh based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013fh:  Sept. 3.146, 18.7 (Federica Luppi and Luca Buzzi, Varese, Italy;
0.36-m f/7.1 reflector; position end figures 38s.34, 41".3; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_E550-G26.jpg); 5.475,
17.8 (Joseph Brimacombe, Cairns, Australia; remotely with a 51-cm RCOS
telescope + STL11K camera + luminance filter at New Mexico Skies observatory
near Mayhill, New Mexico, USA; position end figures 38s.32, 41".4; image
posted at website URL http://www.flickr.com/photos/43846774@N02/9680799379/).

     N. Morrell, Las Campanas Observatory, Carnegie Supernova Project; and
J. L. Prieto, Princeton University, report that on Sept. 2.31 UT they obtained
an optical spectrogram (range 365-950 nm) of PSN J04213820-1755414 = SN 2013fh
with the Las Campanas 2.5-m du Pont telescope (+ WFCCD), which reveals that
this is an evolved type-Ia supernova.  Cross-correlation with a library of
supernova spectra using the Supernova Identification tool (SNID; Blondin and
Tonry 2007, Ap.J. 666, 1024) suggests that 2013fh is very similar to SN 2004eo
at 54 days past maximum, providing also many good matches with other normal
type-Ia supernovae between 50 and 60 days after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 September 13                (CBET 3651)              Daniel W. E. Green