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IAUC 7591: 2001X; V4643 Sgr = N Sgr 2001; 2001C

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                                                  Circular No. 7591
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     W. Li, University of California at Berkeley, communicates that
Y. Fan, Y. L. Qiu, and J. Y. Hu, on behalf of Beijing Astronomical
Observatory (BAO) Supernova Survey, report the discovery of an
apparent supernova (mag about 17.0) found on an unfiltered image
taken with the BAO 0.6-m telescope on Feb. 27.8 UT.  SN 2001X is
located at R.A. = 15h21m55s.45, Decl. = +5 03'42".1 (equinox
2000.0), which is 15".5 west and 32".4 south of the nucleus of NGC
5921.  SN 2001X was confirmed on an unfiltered image taken by M.
Schwartz on Mar. 2.5 with the Tenagra Observatory 0.5-m automatic
telescope, from which Li measured the position end figures to be
55s.46 +/- 0s.03, 43".1 +/- 0".2, and the magnitude of the
supernova to be 15.2.  Images of the same field taken with the BAO
0.6-m telescope on Feb. 6.9 (limiting mag about 17.5) and with the
Tenagra 0.5-m telescope on Feb. 17.5 (limiting mag about 18.0)
showed nothing at this position.  Li remarks that a normal type-Ia
supernova in this galaxy might reach mag about 13.

     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V4643 Sgr has been given to this nova (cf. IAUC
7589, 7590).
     The USNO-A2.0 catalogue contains a red star (also visible on
the Digital Sky Survey) within 1" of the nova's position, at
position end figures 40s.41, 15".4 (cf. IAUC 7589), with the blue
and red magnitudes listed as 17.4 and 15.8, respectively.
Additional visual magnitude estimates:  Mar. 1.249 UT, 10.2 (J. G.
de S. Aguiar, Campinas, Brazil); 1.642, 10.4 (J. Bedient, Honolulu,
HI).  T. Kato, Kyoto University, reports that Y. Nakamura (Suzuka,
Mie) found no sign of the nova to limiting mag about 11.1 on a
Tri-X exposure taken on Feb. 20.852 with a 200-mm f/4 lens.

     CCD photometry, unfiltered unless otherwise noted: Jan. 12.783
UT, R = 14.96 (K. Hornoch, Lelekovice, Czech Republic); 13.824, R =
15.00 (Hornoch); 13.89, V = 15.1 (D. Hanzl, Brno, Czech Republic);
14.822, R = 15.00 (Hornoch); 28.826, R = 15.12 (Hornoch); 31.767,
15.04 (M. Martignoni, Busto Arsizio, Italy); Feb. 2.743, 14.95
(Martignoni); 2.805, R = 15.30 (Hornoch); 11.853, R = 15.76
(Hornoch); 13.800, R = 15.86 (Hornoch).

                      (C) Copyright 2001 CBAT
2001 March 2                   (7591)            Daniel W. E. Green

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