Electronic Telegram No. 2538 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 2010jj IN NGC 812 J. M. Silverman and A. V. Filippenko, University of California, Berkeley; and R. J. Foley, Harvard-Smithsonian Center for Astrophysics, report that inspection of a CCD spectrum (range 330-760 nm), obtained on Nov. 5 UT with the 10-m Keck I telescope (+ LRIS), shows that 2010jj (CBET 2530) is a type-IIn supernova. The object exhibits a relatively featureless, very blue continuum with intermediate-width (FWHM about 1800 km/s) Balmer emission lines superposed. He I 587.6-nm emission is also visible. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 November 6 (CBET 2538) Daniel W. E. Green