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IAUC 7920: 2002dl; 4U 1543-47; 2002di, 2002dk

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                                                  Circular No. 7920
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 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://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2002dl IN UGC 11994
     T. Puckett and A. Langoussis, Mountain Town, GA, report the
discovery of an apparent supernova (mag 17.7) on an unfiltered CCD
frame taken with the Puckett Observatory 0.35-m automated supernova
patrol telescope on June 16.35 UT (and confirmed on a frame taken
on June 17.23).  The new object is located at R.A. = 22h20m53s.96,
Decl. = +33o17'33".7 (equinox 2000.0), which is 10".0 east and 8".7
south of the center of UGC 11994.  SN 2002dl is not present on
images taken by Puckett on 2001 Aug. 15 or Nov. 12 (limiting mag
about 20.5) or on Palomar Sky Survey plates taken on 1989 Sept. 7
and 1986 Oct. 1 (limiting mag about 21.0) and on 1951 Sept. 25
(limiting mag about 20.0).


4U 1543-47
     J. M. Miller and R. A. Remillard, Massachusetts Institute of
Technology (MIT), for the RXTE ASM Team at MIT and NASA Goddard
Space Flight Center, report the detection of a new x-ray outburst
in the blackhole binary 4U 1543-47 (cf. IAUC 5520; archival optical
position R.A. = 15h47m08s.6, Decl. = -47o40'09", equinox 2000.0;
uncertainty +/- 1").  The first detections with the RXTE ASM
indicated a flux (2-12 keV) of 0.054 +/- 0.009 Crab on June 16.683
UT, rapidly increasing to 0.5 (June 17.122) and 1.65 Crab (June
17.552).  The x-ray spectrum is very soft, implying that the
dominant component is thermal emission from the accretion disk.
Optical and radio measurements are strongly encouraged.


SUPERNOVAE 2002di AND 2002dk
     A. V. Filippenko, R. Chornock, and R. J. Foley, University of
California, Berkeley, report that inspection of CCD spectra (range
330-1000 nm) obtained on June 17 UT with the Shane 3-m reflector at
Lick Observatory reveals that both SN 2002di (IAUC 7917) and SN
2002dk (IAUC 7919) are of type Ia, similar to the peculiar,
subluminous SN 1991bg (e.g., Filippenko et al. 1992, A.J. 104,
1543).  The Ti II absorption around 420 nm is strong, and the Si II
580-nm absorption is much more prominent than in normal supernovae
of type Ia.  SN 2002dk is close to maximum brightness, and SN
2002di is somewhat older, perhaps roughly 1 week past maximum.

                      (C) Copyright 2002 CBAT
2002 June 17                   (7920)            Daniel W. E. Green

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