Central Bureau for Astronomical Telegrams
IAUC 8173: 2003gu; 2003gh, 2003gi, 2003gr; 2003gs
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Circular No. 8173
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2003gu IN UGC 12331
Further to IAUC 8103, M. Armstrong reports the discovery of an
apparent supernova (mag 17.2) on unfiltered CCD images taken on
Aug. 3.051 and 3.965 UT. The new object is located at R.A. =
23h02m59s.45, Decl. = +34o43'19".6, which is approximately 1" east
and 18".5 south of the center of UGC 12331. Nothing was visible at
this position on Armstrong's image taken on July 21 (limiting mag
18.5) and on Palomar Sky Survey red or blue plates.
SUPERNOVAE 2003gh, 2003gi, 2003gr
M. Hamuy and N. Morrell, Carnegie Observatories; J. Arias,
Observatorio de La Plata; and R. Barba, Universidad de La Serena,
report that a spectrum (range 390-900 nm) of SN 2003gr (cf. IAUC
8169), obtained on July 31.31 UT with the Las Campanas Observatory
Baade 6.5-m telescope (+ Boller & Chivens spectrograph), shows it
to be a type-Ia supernova. The spectrum bears strong resemblance
to that of SN 1994D taken 11 days after maximum. The minimum of
the Si II 635.5-nm line yields an expansion velocity of -10200 km/s
(adopting the NED host-galaxy recession velocity of 7691 km/s). A
spectrum of SN 2003gh (cf. IAUC 8159), taken on July 31.44, also
shows it to be a type-Ia supernova. The spectrum is similar to
that of SN 1994D taken 38 days past maximum. A spectrum of SN
2003gi (cf. IAUC 8161), taken on July 31.32, shows it to be a
type-Ia supernova. The spectrum is similar to that of SN 1994D
taken 76 days past maximum.
SUPERNOVA 2003gs IN NGC 936
Hamuy also reports, with L. Gonzalez (Universidad de Chile),
the following preliminary CCD magnitudes for SN 2003gs (cf. IAUC
8171) from data obtained with the Las Campanas Observatory Swope
1-m telescope: July 30.33 UT, B = 14.12, V = 13.46, I = 13.31;
July 31.27, 14.23, 13.48, 13.30. These observations suggest that
SN 2003gs is a few days past V maximum. The B-V colors (0.66 and
0.73) at these two epochs is much redder than the color displayed
by normal type-Ia events near maximum light (B-V = 0) but is
similar to that of the subluminous SN 1991bg (Leibundgut et al.
1993, A.J. 105, 301). A spectrum (range 390-900 nm), obtained as
above by N. Morrell on July 31.33 with the Baade telescope,
confirms that SN 2003gs is spectroscopically peculiar (cf. IAUC
8171, 8172). The lack of interstellar Na I D lines suggests that
SN 2003gs is not significantly reddened by dust.
(C) Copyright 2003 CBAT
2003 August 3 (8173) Daniel W. E. Green
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