Central Bureau for Astronomical Telegrams

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IAUC 7906: 2002db; 2000fv; SAX J1819.3-2525; 2002ct

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                                                  Circular No. 7906
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)

SUPERNOVA 2002db IN NGC 5683
     B. Beutler and W. D. Li, University of California at Berkeley,
for the LOTOSS team (whose core members are Li, A. V. Filippenko,
R. R. Treffers, and M. Schwartz, as of 2001 Sept. 1; see also IAUC
7514), report the discovery of an apparent supernova on an
unfiltered CCD image taken with the 0.8-m Katzman Automatic Imaging
Telescope (KAIT) on May 18.3 UT (mag about 17.6).  The new object
was confirmed on an image taken with the 0.6-m telescope at Beijing
Astronomical Observatory by Y. L. Qiu and W. Zhou under poor
conditions on May 20.6.  SN 2002db is located at R.A. =
14h34m51s.63, Decl. = +48o39'52".9 (equinox 2000.0), which is 8".0
west and 9".3 north of the nucleus of NGC 5683.  A KAIT image taken
on May 10.3 showed nothing at this position (limiting mag about

SUPERNOVA 2000fv IN MCG -04-35-11
     Li also reports the discovery of an apparent supernova on
unfiltered CCD archival KAIT images taken during the course of the
Lick Observatory Supernova Search (cf. IAUC 6627, 7126).  SN 2000fv
is located at R.A. = 14h51m09s.98, Decl. = -26o38'11".5 (equinox
2000.0), which is 4".2 east and 5".4 north of the nucleus of MCG
-04-35-11.  Unfiltered KAIT magnitudes for SN 2000fv:  2000 June
6.2 UT, 15.8; 24.2, 15.9; July 1.2, 16.0; 2002 May 14.4, [19.0:.

SAX J1819.3-2525
     C. B. Markwardt, University of Maryland and Goddard Space
Flight Center (GSFC); and J. H. Swank, GSFC, report that RXTE PCA
monitoring observations of the Galactic-center region on May 17.6
and 20.9 UT have shown that SAX J1819.3-2525 (IAUC 7119) =  XTE
J1819-254 (IAUC 7120) = V4641 Sgr (IAUC 7277) is again active as an
x-ray source.  This source was previously active in 1999 as a
"microquasar" and is a confirmed dynamical blackhole system (Orosz
et al. 2001, Ap.J. 555, 489).  X-ray fluxes of 4.5 +/- 0.3 and 10.0
+/- 0.5 mCrab (in the band 2-10 keV) were detected at the two
observation epochs, at a position consistent with the source.
Follow-up RXTE observations are being scheduled.

     Corrigendum.  On IAUC 7898, line 5, *for*  13" west  *read*
13" east

                      (C) Copyright 2002 CBAT
2002 May 21                    (7906)            Daniel W. E. Green

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