Central Bureau for Astronomical Telegrams
IAUC 8411: 2004du, 2004ek, 2004em,, 2004en; 2004eq; 4U 0115+63
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Circular No. 8411
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2004du, 2004ek, 2004em, AND 2004en
A. V. Filippenko, M. Ganeshalingam, and B. J. Swift,
University of California, Berkeley, write: "Inspection of CCD
spectra (range 330-1000 nm), obtained on Sept. 24 UT with the Shane
3-m reflector at Lick Observatory, reveals that SN 2004em (IAUC
8406) is of type II, shortly after the explosion. The object has a
blue, nearly featureless continuum and clear hydrogen Balmer lines
with P-Cyg profiles, but the emission component of H_alpha is
considerably stronger than the absorption component. Weak He I
587.6-nm absorption is visible, as well. SN 2004en (IAUC 8406) is
also of type II, but somewhat older, perhaps a few weeks after the
explosion. SN 2004du (IAUC 8387) appears to be a normal type-II-P
supernova with typical P-Cyg profiles; the narrow H_alpha emission
line responsible for the previous classification of type IIn (IAUC
8388) was based partly on a superposed H II region. We confirm the
suggestion that SN 2004ek (IAUC 8405) is a young type-II supernova
with a blue continuum (IAUC 8409), but now the flux density
shortward of 400 nm drops substantially. There are weak hydrogen
Balmer and Fe II absorption lines, although the weak H_alpha line
is almost entirely in emission."
SUPERNOVA 2004eq IN ESO 404-G12
Y. Chen provides a corrected position for SN 2004eq (cf. IAUC
8407): R.A. = 21h57m09s.46, Decl. = -34o34'51".3 (equinox 2000.0),
which is 23".1 east and 4".3 north of the center of ESO 404-G12 =
PGC 67701. He adds that a bright nearby foreground star has
position end figures 09s.10, 48".1.
4U 0115+63
J. Tueller, Goddard Space Flight Center (GSFC), on behalf of
the InFOCuS team (a collaboration between NASA/GSFC, Nagoya
University, JAXA/ISAS, and the University of Pennsylvania), reports
that observations of the transient x-ray pulsar 4U 0115+63 (cf.
IAUC 3161, 7116) were made with a balloon-borne hard-x-ray focusing
telescope (launched from Ft. Sumner, NM) for 3200 s starting at
Sept. 17.19 UT. The pulsar is continuing an outburst first
detected by RXTE/ASM during Aug. 27-Sept. 2 (cf.
http://xte.mit.edu/XTE.html). A preliminary 20-50-keV flux of 3.18
(+0.375/-0.324) x 10**-9 erg cm**-2 s**-1, consistent with the
RXTE/ASM data, was derived from data obtained during Sept. 17.20-
17.22. A summed-epoch analysis yields a preliminary pulse period
of 3.616 +/- 0.001 s.
(C) Copyright 2004 CBAT
2004 September 25 (8411) Daniel W. E. Green
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