Electronic Telegram No. 3448
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 2013at = PSN J18501129+3020595
     V. Lipunov, Sternberg Astronomical Institute (SAI), reports the discovery
by S. Shurpakov of a possible supernova (mag 16.9) on two unfiltered survey
CCD images (limiting mag 18.2) taken on Mar. 19.748 and 19.776 UT with the
MASTER-Amur robotic telescope (0.40-m f/2.5 reflector).  The new object is
located at R.A. = 18h50m11s.29, Decl. = +30o20'59".5 (equinox 2000.0), which
is 11".9 west and 15".1 south of the nucleus of the presumed host galaxy.
D. Denisenko and E. Gorbovskoy (SAI) report that nothing is visible at this
position on Feb. 24.860 images from the same telescope (limiting magnitude
18.0).  The discovery and reference images are posted at website URL
http://master.sai.msu.ru/static/OT/185011.29302059.5.png and at website URL
http://master.sai.msu.ru/static/OT/J185011+302059-BRIR5x5.jpg.  The variable
was designated PSN J18501129+3020595 when it was posted at the Central
Bureau's TOCP webpage and is here designated SN 2013at based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2013at:  Mar. 21.144, 17.5 (F. Luppi and L. Buzzi, Varese, Italy; 0.38-m
reflector; position end figures 11s.23, 59".7; image posted at website URL
http://www.astrogeo.va.it/pub/TOCP/PSN_P2813322.jpg); 24.416, 17.3
(Joseph Brimacombe, Cairns, Australia; remotely with a 51-cm RCOS telescope
+ luminance filter at the New Mexico Skies observatory near Mayhill, NM,
U.S.A.; position end figures 11s.23, 59".3; image posted at website URL
http://www.flickr.com/photos/43846774@N02/8589123510/).

     Edo Berger, Maria Drout, Allyson Bieryla, Zoey Bergstrom, Ana-Maria
Constantin, Sara Duval, Nina Hooper, Jonathan Jackson, Rachel Jiang, Alex
Krolewski, Evan Liang, Erin Lotridge, Christopher Magnani, Missy Mcinstosh,
Katie Rice, James Ryan, and Nuseir Yassin, Harvard University, obtained a
low-resolution optical spectrum of PSN J18501129+3020595 = SN 2013at on
Mar. 21.44 UT using the FAST spectrograph mounted on the F.L. Whipple
Observatory 1.5-m telescope, as part of an undergraduate astronomy course.
The spectrum exhibits strong hydrogen Balmer P-Cyg lines, indicating a
type-II supernova.  Using SNID (Blondin and Tonry 2007, Ap.J. 1024, 666),
they find a best match with type-IIP supernova templates at a redshift of
z = 0.02 and phase of +4 days.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2013 CBAT
2013 March 26                    (CBET 3448)              Daniel W. E. Green