[IAUC] CBET 2487: 20101008 : POSSIBLE NOVA IN M31: M31N 2010-10b

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                                                  Electronic Telegram No. 2487
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


POSSIBLE NOVA IN M31:  M31N 2010-10b
     Kamil Hornoch, Astronomical Institute, Ondrejov, reports his discovery
of a possible nova in M31 on a co-added 990-s R-band CCD frame taken on Oct.
6.932 UT with the 0.65-m telescope at Ondrejov.  The new object, designated
M31N 2010-10b, is well visible on the co-added frame and faintly visible also
on single images used for the co-added frame, but it is not present on
numerous archival images taken at Lelekovice and Ondrejov.  The object is
visible also on four pre-discovery Ondrejov R-band CCD images taken between
Aug. 19.055 and Sept. 20.777.  Available magnitudes for M31N 2010-10b,
measured by Hornoch:  July 10.200, [22.0 (J. Corral-Santana and J. Casares,
2.54-m Isaac Newton Telescope + Sloan r' filter); Aug. 19.055, R = 20.0 +/-
0.3 (Hornoch and P. Hornochova, 0.65-m telescope at Ondrejov); 25.097, R =
19.6 +/- 0.25 (Hornoch and Hornochova); Sept. 14.128, R = 19.4 +/- 0.2
(Hornoch and Hornochova); 20.777, R = 19.5 +/- 0.2 (Hornoch and Hornochova);
Oct. 6.932, R = 18.9 +/- 0.15 (Hornoch, 0.65-m telescope at Ondrejov); 7.767,
R = 18.9 +/- 0.15 (Hornoch and M. Wolf, 0.65-m telescope at Ondrejov).
M31N 2010-10b is located at R.A. = 0h42m41s.51, Decl. = +41o03'27".3 (equinox
2000.0), which is 32" west and 761" south of the center of M31.


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                         (C) Copyright 2010 CBAT
2010 October 8                   (CBET 2487)              Daniel W. E. Green