Electronic Telegram No. 2063
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


APPARENT NOVAE IN M81:  M81N 2009-11a, M81N 2009-11b, M81N 2009-11c
     Kamil Hornoch, Astronomical Institute, Ondrejov; and Ondrej Pejcha,
Department of Astronomy, Ohio State University, report their discovery of
an apparent nova in the galaxy M81 from a co-added 360-s Sloan-r' CCD frame
taken by Pejcha with RETROCAM on the 2.4-m Hiltner telescope at MDM
Observatory on Nov. 25.484 UT.  The new object is well visible on single
60-s images used for the co-added image and on a pre-discovery co-added
2790-s unfiltered image taken by Hornoch with the 0.65-m telescope at
Ondrejov on Nov. 13.106.  M81N 2009-11c is located at R.A. = 9h55m07s.74 +/-
0s.01, Decl. = +69o08'10".4 +/- 0".2 (equinox 2000.0), which is 136" west
and 256" north of the center of M81.  The new object is not present on
numerous archival images from the 2.54-m Isaac Newton Telescope, the 4.2-m
William Herschel Telescope, the 4-m Mayall telescope, and the 8.2-m Subaru
telescope, down to limiting magnitudes as faint as Sloan r' = 23.3, R = 23.4,
and V = 23.8.  Available magnitudes for nova M81N 2009-11c, measured by
Hornoch:  Nov. 13.106, 19.9 +/- 0.2 (unfiltered; R-band magnitudes for
comparison stars were used); 25.484, r' = 21.4 +/- 0.15; 27.098, 21.3
+/- 0.2 (as on Nov. 13.106).
     Hornoch also sends the following magnitudes measured from a 6240-s
co-added unfiltered image that he took on Nov. 27.098 UT with the 0.65-m
telescope (again, comparison-star R-band magnitudes were used) for his
two other recent apparent novae in M81 (cf. CBET 2051):  M81N 2009-11a,
21.6:; M81N 2009-11b, 22.3 +/- 0.3.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 December 2                  (CBET 2063)              Daniel W. E. Green