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IAUC 8435: 2004fy NEAR MCG +15-1-10; V4743 Sgr; 2004et

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                                                  Circular No. 8435
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 2004fy NEAR MCG +15-1-10
     Further to IAUC 8431, T. Puckett and B. Kerns report the
discovery of an apparent supernova (mag 17.0) on unfiltered CCD
frames taken with the 0.35-m automated supernova patrol telescope
on Nov. 10.46 and 11.06 UT.  The new object is located at R.A. =
11h41m14s.96, Decl. = +89o05'10".6 (equinox 2000.0), which is 9".2
east and 5".7 south of the center of MCG +15-1-10.  Nothing is
visible at this location on Palomar Sky Survey images taken on 1988
Jan. 28 and 1998 Apr. 22 (limiting mag about 21.0).

     M. Orio, Italian National Institute for Astrophysics, Turin,
and University of Wisconsin; and E. Tepedelenlioglu, University of
Wisconsin, report that V4743 Sgr was observed with the XMM-Newton
satellite beginning on Sept. 30.783 UT for about 6.2 hr (two years
after the optical outburst).  The EPIC-pn background-corrected
count rate was 0.347 +/- 0.007 counts/s in the range 0.3-10 keV in
timing mode, while count rates of 0.101 +/- 0.002 and 0.107 +/-
0.002 counts/s were measured with EPIC-MOS-1 and EPIC-MOS-2,
respectively, in the range 0.2-10 keV.  The average absorbed flux
in the range 0.2-10 keV is about 1.3 x 10**-12 erg cm**-2 s**-1, a
factor of 1000 lower than the flux measured in March and April 2003
(IAUC 8107, 8131).  The nova still appears as a supersoft x-ray
source, and deep absorption features due to N VII and N VI are
still detected, but there is also a hard component, possibly due to
the ejecta.  Preliminary results from the lightcurve analysis show
again several peaks in the power spectrum, the highest of them at
the frequency corresponding to a 1365-s period.

SUPERNOVA 2004et IN NGC 6946
     R. J. Beswick, T. W. B. Muxlow, M. K. Argo, and A. Pedlar,
Jodrell Bank Observatory; and J. M. Marcaide, University of
Valencia, report the radio detection of SN 2004et at 4.994 GHz,
using a subset of the MERLIN array.  A compact radio source at R.A.
= 20h35m25s.360, Decl. = +60o07'17".74 (equinox 2000.0, +/- 0".04
in each coordinate) is consistent with the radio position reported
by Stockdale et al. (IAUC 8415).  MERLIN 4.994-GHz radio-flux
measurements for SN 2004et are:  Sept. 30-Oct. 13, 0.4 +/- 0.3 mJy;
Oct. 15-17, 0.61 +/- 0.4; Oct. 18-20, 1.55 +/- 0.3; Oct. 25-27,
1.31 +/- 0.4; Oct. 27-28, 1.34 +/- 0.4; Oct. 29-30, 1.55 +/- 0.3;
Oct. 31-Nov. 1, 1.89 +/- 0.3, Nov. 2, 2.39 +/- 0.3.  MERLIN and VLA
radio monitoring is continuing.

                      (C) Copyright 2004 CBAT
2004 November 11               (8435)            Daniel W. E. Green

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