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IAUC 7456: 2000cv; 2000cw; XTE J1859+226

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IAUC number

                                                  Circular No. 7456
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 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 2000cv IN PGC 39222
     W. D. Li, University of California at Berkeley, reports the
discovery by M. Schwartz, Cottage Grove, OR, of an apparent
supernova (mag about 16.1) on unfiltered CCD images obtained in the
course of the Tenagra Observatory Supernova Search with the 0.35-m
Tenagra-I automated telescope on July 11.2 and 12.2 UT.  SN 2000cv
is located at R.A. = 12h15m42s.04, Decl. = +61o53'24".6 (equinox
2000.0).  SN 2000cv was also confirmed in an unfiltered CCD image
obtained by Li with the Katzman Automatic Imaging Telescope (KAIT)
on July 12.2 (mag about 16.0), from which Li measured the position
end figures as 42s.21, 24".0, which is 9".6 east and 1".2 north of
the nucleus of PGC 39222.  Digital Sky Survey images of the field
from 1955 (limiting mag about 20.0), 1993 (limiting mag 21.5), and
1994 (limiting mag about 21.0) show no stellar object at the
position of SN 2000cv.

SUPERNOVA 2000cw IN MCG +5-56-007
     M. Modjaz, A. B. Aazami, 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 KAIT of
an apparent supernova on unfiltered images taken on July 14.5 (mag
about 17.4) and 15.5 UT (mag about 17.2).  The new object is
located at R.A. = 23h47m25s.10, Decl. = +28o23'15".8 (equinox
2000.0), which is 8".4 east and 21".2 south of the nucleus of MCG
+5-56-007.  A KAIT image of the same field taken on July 5.5 showed
nothing at the position of SN 2000cw (limiting mag about 19.0).

XTE J1859+226
     J. A. Tomsick and W. A. Heindl, Center for Astrophysics and
Space Sciences, University of California at San Diego, write:  "An
RXTE observation of the x-ray transient XTE J1859+226 made on July
8.5 UT indicates a 2.5-20-keV flux level of 3 x 10**-11 erg cm**-2
s**-1, which is well above the expected quiescent x-ray flux level.
The higher-than-expected x-ray flux may be related to the optical
minioutburst reported on IAUC 7451.  The energy spectrum is well-
described by a power law with a photon index of 2.03 +/- 0.14.
There is evidence for two short (< 16 s) x-ray dips during the
3000-s RXTE observation, possibly indicating a moderately high
binary inclination.  During the deepest dip, the flux drops to 33
+/- 19 percent of the mean flux level in the energy band 2.9-10.5
keV.  Further x-ray observations are required to determine if the
dips are related to the binary orbit."

                      (C) Copyright 2000 CBAT
2000 July 16                   (7456)            Daniel W. E. Green

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