Electronic Telegram No. 2534
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 2010jk
     K. Sarneczky, Konkoly Observatory; and Z. Kuli, Hungarian Astronomical
Association, report the discovery of a possible supernova (mag 20.2) in 20-min
co-added unfiltered CCD images taken on Oct. 31.825 UT with the 0.60-m
Schmidt telescope at Konkoly Observatory, Piszkesteto, Hungary.  The new
object -- which is also present at mag 20.4 in an image taken on Oct. 29.873,
and at mag 20.0 on Nov. 1.824 -- is located at R.A. = 1h12m35s.63, Decl. =
+15d28'28".5 (equinox 2000.0), which is 0".5 north of the center of the
presumed host galaxy, SDSS J011235.64+152828.0 (whose r magnitude is 20.9).
No point source is visible at this position on a co-added 20-min reference
image taken on 2010 Oct. 7 (limiting mag 21.5).  An animated gif showing the
variable is posted at http://titan.physx.u-szeged.hu/~sky/poss-sn.gif.

     J. Vinko, University of Szeged; J. C. Wheeler and E. Chatzopoulos,
University of Texas; and G. H. Marion, Harvard-Smithsonian Center for
Astrophysics and University of Texas, report that a spectrogram of 2010jk was
obtained on Nov. 4.11 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario
Low-Resolution Spectrograph) by M. Shetrone.  The spectrum shows a blue
continuum with no obvious spectral features, except a few noisy peaks between
780 and 850 nm.  The lack of broad features prevents unambiguous
identification, but the appearance of the spectrum is consistent with that of
a very young type-II (probably a type-IIn) supernova.  The SuperNova
IDentification code (Blondin and Tonry 2007, Ap.J. 666, 1024) gives SN 1997cy
(cf. IAUC 6708) as the best resembling template (without the broad H-alpha
component) at z = 0.28.  If this were the correct redshift, then the measured
apparent magnitude of 20.0 would correspond to absolute magnitude -20.3, which
may suggest an over-luminous type-IIn supernova.  Further monitoring of this
interesting object is encouraged.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 November 5                  (CBET 2534)              Daniel W. E. Green