[IAUC] CBET 2672: 20110311 : SUPERNOVA 2011X1 IN UGC 2509 = PSN J03032521+0429399

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                                                  Electronic Telegram No. 2672
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 2011X1 IN UGC 2509 = PSN J03032521+0429399
     Further to CBET 2671, M. Kandrashoff, S. B. Cenko, W. Li, and A. V.
Filippenko report the LOSS discovery of an apparent supernova on unfiltered
KAIT images:

 SN       2011 UT       R.A. (2000.0) Decl.      Mag.      Offset
 2011X1   Jan. 27.20   3 03 25.21  + 4 29 39.9   19.0    15".1 E, 8".9 N

The variable was designated PSN J03032521+0429399 when posted on the Central
Bureau's TOCP webpage and is designated SN 2011X1 here based on the
spectroscopic report below.  Additional KAIT magnitudes for 2011X1 in UGC
2509:  a co-added frame from Dec. 2010 to Jan. 2011, [20.3; 2011 Jan. 28.19
UT, 19.2.

     J. M. Silverman, S. B. Cenko, and A. V. Filippenko, University of
California, Berkeley, report that inspection of a relatively noisy CCD
spectrum (range 330-1000 nm), obtained on Mar. 9 UT with the 10-m Keck I
telescope (+ LRIS), shows that PSN J03032521+0429399 = 2011X1 is a type-II
supernova.  After removal of the host-galaxy recession velocity of 5860 km/s
(measured from narrow host-galaxy emission lines), they find the absorption
minimum of the H-alpha line to be blueshifted by about 7150 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      superseded by text appearing later in the printed IAU Circulars.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 March 11                    (CBET 2672)              Daniel W. E. Green