Electronic Telegram No. 2744
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 2011dl IN UGC 10321 = PSN J16180497+2133040
     R. Gorelli, J. Newton, and T. Puckett report the discovery of an apparent
supernova (mag 16.9) on an unfiltered CCD image (limiting mag 19.0) taken with
a 0.40-m reflector at Portal, AZ, U.S.A., on June 17.314 UT in the course of
the Puckett Observatory Supernova Search.  The new object, which was confirmed
at mag 16.9 on June 19.163 by Puckett with the 40-cm reflector at Portal, is
located at R.A. = 16h18m04s.97 Decl. = +21o33'04".0 (equinox 2000.0), which
is 4".2 west and 9".2 south of the center of UGC 10321.  Nothing is visible at
this position on images taken by Puckett on 2011 May 31 (limiting mag 19.0).
The variable was designated PSN J16180497+2133040 when posted on the Central
Bureau's TOCP webpage and is here designated SN 2011dl based on the
spectroscopic report below.  A finder image is located at the following
website URL:  http://possdata.com/PSNJ16180497+2133040.jpg.

     D. Milisavljevic, J. Thorstensen, and R. Fesen, Dartmouth College, report
that low-dispersion optical spectra (range 470-670 nm), obtained on June 21.5
UT with the 2.4-m Hiltner telescope (+ Modspec) at MDM Observatory
of PSN J16180497+2133040 = SN 2011dl, show it to be a type-Ia supernova.
Cross-correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
matches with normal type-Ia events at a few days before maximum light.  Using
a SNID-estimated redshift of z = 0.026, the velocity of the Si II 635.5-nm
feature is approximately 13200 km/s.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 June 21                     (CBET 2744)              Daniel W. E. Green