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IAUC 7405: Cyg X-3; 1999gv; V1333 Aql

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                                                  Circular No. 7405
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)

     E. B. Waltman, Naval Research Laboratory; and F. D. Ghigo,
National Radio Astronomy Observatory, report:  "The Green Bank
Interferometer has observed the strongest flare in Cyg X-3 since
1991.  Flux densities reached 17 Jy at 8 GHz and 11 Jy at 2 GHz
on Apr. 19.6 UT, following an extended period of very low hard
x-rays (IAUC 7365).  The data may be accessed at

     A. Gal-Yam and D. Maoz, Tel Aviv University, report:
"Comparison between Hubble Space Telescope (HST) WFPC2 images (all
with limiting mag 25 or fainter) of the rich galaxy cluster Abell
2218, obtained with the F606W filter on 2000 Jan. 11-13 and 1999
Mar. 11 and with the F702W filter (considered to have a 'broad B'
bandpass) on 1994 Sept. 3, reveals an unresolved object that is
present in images obtained in March 1999 but absent from the more
recent and the older images.  The transient object (mag 22.8 in the
HST F606W filter system, which is considered to have a 'broad V'
bandpass) is located 2".8 west and 0".8 south of the nucleus of one
of the brighter cluster galaxies, whose center is located at R.A. =
16h36m00s.74, Decl. = +66o13'19".9 (equinox 2000.0).  SN 1999gv is
present in twelve consecutive images taken between 1999 Mar. 11.084
and 11.256 UT, and we estimate an upper limit of 0".012 for the
proper motion of the object during the 4-hr period of observations.
In view of the lack of any apparent motion or elongation of the PSF
and the close coincidence with a cluster galaxy, we assess that the
object is most likely a supernova.  The host galaxy is catalogued
as number 149 in the list by Le Borgne et al. (1992, A.Ap. Suppl.
95, 87), where its redshift is given as z = 0.1753 and its
magnitude as B = 19.89.  We are trying to constrain the supernova
light curve using groundbased observations of this cluster that we
obtained during 1998-1999 with the Keck II 10-m, WIYN 3.5-m, and
Wise 1-m telescopes.  Observers with relevant data, especially deep
images of Abell 2218 taken between Feb. and Apr. 1999, are invited
to contact the first author (avishay@wise.tau.ac.il).  An image of
SN 1999gv can be seen at http://wise-obs.tau.ac.il/~avishay/a2218.jpg."

     Corrigendum.  On IAUC 7161, line 12, for  9 hr  read  4.3 hr

                      (C) Copyright 2000 CBAT
2000 April 19                  (7405)            Daniel W. E. Green

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