Electronic Telegram No. 2181 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html APPARENT NOVA IN M31: M31N 2010-01d Further to CBETs 2061 and 2124, W. Pietsch reports the detection of an apparent nova of mag 15.8 in ultraviolet SWIFT images taken of M31 on Jan. 15.52 UT; designated M31N 2010-01d, the new object is located at R.A. = 0h42m42s.81, Decl. = +41d16'14".7 (equinox 2000.0), which is 17" west and 5" north of the nucleus of M31. K. Hornoch, Ondrejov Observatory, measures position end figures 42s.79, 14".3 (offset 17".3 west, 5".8 north) for M31N 2010-01d and provides the following magnitudes from co-added R-band CCD frames: Jan. 2.799, [19.9 (CCD frame taken during software tests by P. Kubanek, J. Gorosabel, P. Martorell, and M. Jelinek with the 1.23-m telescope at Calar Alto); 16.795, 16.7 +/- 0.3 (K. Hornoch, 0.65-m telescope at Ondrejov); 30.845, 19.5: (Kubanek, N. Morales, J. L. Ortiz, Gorosabel, and Jelinek, 1.23-m telescope at Calar Alto); 31.838, 18.9 +/- 0.3 (Kubanek, Morales, Ortiz, Gorosabel, and Jelinek). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 February 21 (CBET 2181) Daniel W. E. Green