[IAUC] CBET 2634: 20110113 : SUPERNOVA 2011H NEAR UGC 1837

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2634
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 2011H NEAR UGC 1837
     Further to CBET 2630, A. Narla, S. B. Cenko, W. Li, A. A. Miller, 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
 2011H    Jan. 4.26    2 23 06.02  +43 02 32.4   15.6    83".1 E, 109".6 N

Additional KAIT magnitudes for 2011H:  2010 Dec. 2.24 UT, [19.1; 2011 Jan.
6.26, 15.9.

     L. Lopez, D. Kirkman, and D. Tytler, University of California, San Diego,
obtained a spectrum (range 310-810 nm) of 2011H with the 3-m Shane reflector
(+ Kast) at Lick Observatory on Jan. 9 UT.   Cross-correlation with a library
of supernova spectra using the "SuperNova IDentification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) indicates that 2011H is a normal type-Ia
supernova somewhat past maximum light.  A redshift of z = 0.020 +/- 0.003 is
derived, based on the broad supernova features, consistent with the reported
redshift for UGC 1837 (z = 0.021955 from NED).  However, due to the large
spatial offset, the supernova's host-galaxy identification is quite ambiguous.
Given that UGC 1837 resides in a galaxy group, 2011H could be an intracluster
supernova, or the progenitor system may have originated in a more nearby,
faint, and uncatalogued group member.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 January 13                  (CBET 2634)              Daniel W. E. Green