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IAUC 7837: 2002bh; 2002bi; XTE J1650-500

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IAUC number 

                                                  Circular No. 7837
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 2002bh IN UGC 5286
     M. Ganeshalingam and W. D. Li, University of California at
Berkeley, report the LOTOSS (cf. IAUC 7514) discovery of an
apparent supernova on unfiltered CCD images taken with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT) on Feb. 24.3 (mag about
17.1) and 25.3 UT (mag about 17.2).  SN 2002bh is located at R.A. =
9h51m06s.56, Decl. = +9 00'05".7 (equinox 2000.0), which is 8".2
east and 25".8 south of the nucleus of UGC 5286.  A KAIT image
taken on Feb. 10.3 showed nothing at this position (limiting mag
about 19.0).


SUPERNOVA 2002bi IN UGC 8527
     Li also reports the LOTOSS discovery of another apparent
supernova in an unfiltered KAIT image taken on Feb. 25.4 UT (mag
about 17.1).  SN 2002bi is confirmed at mag about 16.2 in an
earlier KAIT image taken on Jan. 31.5.  The new object is located
at R.A. = 13h32m54s.45, Decl. = +9 31'18".0 (equinox 2000.0), which
is 3".0 east and 3".9 north of the nucleus of UGC 8527.  A KAIT
image taken on 2001 May 29.3 showed nothing at this position
(limiting mag about 19.0).


XTE J1650-500
     J. A. Tomsick and E. Kalemci, University of California at San
Diego; S. Corbel, Universite Paris 7 and Laboratoire du
Commissariat a l'Energie Atomique, Saclay; and P. Kaaret, Harvard-
Smithsonian Center for Astrophysics, report on a series of 30 RXTE
observations of the blackhole-candidate x-ray transient XTE
J1650-500 (cf. IAUC 7707, 7708, 7710, 7715) taken between 2001 Dec.
27 and 2002 Feb. 24:  "During this time, the 3- to 20-keV light
curve exhibits a large amplitude oscillation with a 13.5- to 14.0-
day period about a mean flux of 6.6 x 10**-11 erg cm**-2 s**-1.
The level of modulation is extremely high and roughly sinusoidal
with a peak-to-peak flux variation that is close to, or possibly
greater than, an order of magnitude.  In addition to the four
oscillation cycles we observe, the oscillation may have been
present at a significantly lower level earlier in the outburst,
based on the All-Sky Monitor 1.5- to 12-keV light curve.  The 14-
day period may be orbital, but we believe a disk precession origin
(as seen in Her X-1) is more likely.  Observations are encouraged
to determine if the 14-day oscillation is seen at other wavelengths
and to look for possible orbital or superhump signatures."

                      (C) Copyright 2002 CBAT
2002 February 26               (7837)            Daniel W. E. Green

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