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IAUC 6673: 1997cp; Cyg X-3; 1997bs; 29P

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IAUC number

                                                 Circular No. 6673
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/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)

     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6639) reports the discovery of an apparent supernova (R =
20.3) on V and R CCD images taken on June 2 by S. Sabine at the
Mount Stromlo 1.27-m telescope (+ Macho Camera).  SN 1997cp is
located near Abell 3806 at R.A. = 21h44m36s.50, Decl. =
-57o25'30".4 (equinox 2000.0).  A nearby star has position end
figures 36s.77, 31".9.  SN 1997cp was also present on similar
frames taken on June 3, but it is not visible on images taken on
May 11 (limiting mag R = 21.2).  Finding charts are available at

     M. L. McCollough for the Compton Gamma Ray Observatory BATSE
team; E. B. Waltman, Naval Research Laboratory; and G. G. Pooley,
Mullard Radio Astronomy Observatory, Cambridge, report:  ''Very low
flux levels have been observed in radio and hard x-rays from Cyg X-3
since May 29.  Very low radio fluxes of < 10 mJy have been observed
at 2 and 8 GHz with the Green Bank Interferometer and at 15 GHz
with the Ryle Telescope.  Daily averages for May 29 to June 1 of
the hard-x-ray flux in the band 20--100 keV have been below the
BATSE one day detection limit of 100 mCrab.  In Cyg X-3, periods of
very low radio flux have durations from days to a few weeks and are
followed by major radio flares (5 Jy or larger).  A period of very
low radio emission in 1991 coincided with the observation of strong
infrared emission lines in Cyg X-3.  Observations at other
wavelengths, especially infrared, are encouraged."

SUPERNOVA 1997bs IN NGC 3627
     Unfiltered CCD magnitude estimates by S. Moretti and S.
Tomaselli, Forli, Italy:  May 2.92 UT, 17.5; 27.88, 18.6 (GSC
comparison stars).

     Total magnitude estimates, visual unless otherwise noted:  May
1.95 UT, 13.1 (J. Carvajal, Teruel, Spain, 0.44-m reflector); 30.17,
11.4 (P. E. Roques, Williams, AZ, 0.25-m reflector + CCD + Kron-
Cousins V filter); June 1.90, 11.0 (K. Hornoch, Lelekovice, Czech
Republic, 0.35-m reflector); 3.19, 12.7 (A. Hale, Cloudcroft, NM,
0.41-m reflector).

                      (C) Copyright 1997 CBAT
1997 June 4                    (6673)            Daniel W. E. Green

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