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IAUC 8565: 2005cs; 2005cu; C/2001 Q9, C/2001 S3; X-RAY FLASH IN M51

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IAUC number 

                                                  Circular No. 8565
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 2005cs IN M51
     W. Li and A. V. Filippenko, University of California, Berkeley;
and S. D. Van Dyk, Spitzer Science Center, California Institute of
Technology, report:  "New images from the Advanced Camera for
Surveys (ACS) onboard the Hubble Space Telescope, obtained as part
of GO-10182 (PI: Filippenko) on July 11.50 UT, confirm our previous
identification (IAUC 8556) of the progenitor of the type-II SN
2005cs.  When the new HRC/F250W images are geometrically
transformed to the pre-supernova WFC/F814W images, the SN 2005cs
position is consistent with our identified progenitor to within 0.1
ACS pixel (0".005)."


SUPERNOVA 2005cu IN NGC 6754
     D. C. Leonard, California Institute of Technology, reports
that CCD spectra (range 330-900 nm) of SN 2005cu (IAUC 8562),
obtained on July 12 UT with the Keck I 10-m telescope (+ LRISp),
shows it to be a young type-II supernova.  The spectrum consists of
a blue continuum and P-Cyg profiles of the Balmer and He lines.
Adopting the NED recession velocity of 3257 km/s for the host
galaxy (from Mathewson et al. 1992, Ap.J. Suppl. 81, 413), the
expansion velocity derived from the minimum of the H_beta line is
about 9000 km/s.  Zero-velocity interstellar Na I D absorption with
an equivalent width of about 0.07 nm is detected in the spectrum of
SN 2005cu, indicating gas along the line-of-sight in our galaxy and
thus suggesting some reddening by dust.  Schlegel et al. (1998,
Ap.J. 500, 525) estimate E(B-V) = 0.07 mag of Galactic reddening
along the line-of-sight to NGC 6754.  Interstellar Na I D
absorption is detected also at the redshift of the host galaxy,
with an equivalent width of about 0.13 nm, suggesting some host-
galaxy extinction.


COMETS C/2001 Q9 AND C/2001 S3 (SOHO)
     Additional Kreutz sungrazing comets found on SOHO website
images (cf. IAUC 8563), both objects appearing stellar:

 Comet       2005 UT       R.A.(2000)Decl.  Inst.  F    MPEC
 C/2001 Q9   Aug. 16.221   9 24.3   +12 32   C3    RK   2005-N60
 C/2001 S3   Sept.28.763  12 03.3   - 2 57   C3    RK   2005-N60


X-RAY FLASH IN M51
     Corrigendum.  On IAUC 8564, line 20, *for*  4800 s  *read*
48000 s

                      (C) Copyright 2005 CBAT
2005 July 12                   (8565)            Daniel W. E. Green

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