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IAUC 7498: C/2000 S2; 2000dn; X-RAY TRANSIENT IN M32

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                                                  Circular No. 7498
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)

     F. Shelly and R. Huber, MIT Lincoln Laboratory, report the
discovery by LINEAR of a comet with a tail in p.a. about 280 deg,
as given below.  Confirmation of cometary appearance on Sept. 29.1
UT has been received from P. Pravec and P. Kusnirak at Ondrejov
(coma diameter 0'.2 with a 0'.2 tail in p.a. 260 deg) and from J.
 Ticha and M. Tichy at Klet (object diffuse with 14'' tail in p.a.
265 deg).

     2000 UT             R.A. (2000) Decl.        m1
     Sept.27.44573    7 11 15.46   +27 43 48.5   18.6

Available astrometry and preliminary parabolic orbital elements (T
= 2000 July 27.6 TT, q = 1.305 AU, i = 20.2 deg) are published on
MPEC 2000-S67.

SUPERNOVA 2000dn IN IC 1468
     C. Yu and W. D. Li, University of California at Berkeley, on
behalf of the Lick Observatory Supernova Search (cf. IAUC 6627,
7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of an apparent supernova on unfiltered
images taken on Sept. 27.2 (mag about 17.9) and 28.2 UT (mag about
17.7), and located at R.A. = 23h05m05s.86, Decl. = -3o12'01".0
(equinox 2000.0), which is 25".8 west and 15".2 north of the
nucleus of IC 1468.  A KAIT image of the same field taken on Sept.
16.2 showed nothing at the position of SN 2000dn (limiting mag
about 18.5).

     M. R. Garcia, S. S. Murray, F. A. Primini, and J. E.
McClintock, Smithsonian Astrophysical Observatory; and P. J.
Callanan, University College, Cork, communicate:  "We have
discovered a bright x-ray transient apparently within M32, about
40" southwest of the nucleus of M32.  The transient is located at
R.A. = 0h42m40s.7, Decl. = +40o51'17".7 (equinox 2000.0; 90-percent
error radius 2".0).  The source luminosity is about 10**38 erg/s in
the Chandra bandpass (0.2-10.0 keV), as seen in HRC and ACIS images
from Sept. 11 and 21, respectively.  A Chandra observation on Aug.
18 sets a pre-outburst upper limit on the source luminosity of
10**36 erg/s.  The next Chandra observations of this field will
occur during the weeks starting Oct. 9 and 16.  The scaling of
x-ray transients within our own galaxy (e.g., GRO J0422+32 and
A0620-00) to the distance of M32 indicates that an optical
counterpart may be as bright as U about 24."

                      (C) Copyright 2000 CBAT
2000 September 29              (7498)            Daniel W. E. Green

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