Central Bureau for Astronomical Telegrams
IAUC 8164: 2003gm; 2003gk, 2003gl
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Circular No. 8164
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 2003gm IN NGC 5334
Further to IAUC 8163, M. Schwartz, P. Holvorcem, and W. Li
report the discovery via LOTOSS of an apparent supernova (mag about
17.0) on an unfiltered Tenagra II image taken on July 6.2 UT under
poor conditions. The new object was confirmed at about the same
brightness on a KAIT image taken on July 11.2. SN 2003gm is
located at R.A. = 13h52m51s.72, Decl. = -1 06'39".2 (equinox
2000.0), which is 40".3 west and 13".4 north of the nucleus of
NGC 5334. A KAIT image taken on June 18.2 showed nothing at this
position (limiting mag about 19.0).
SUPERNOVAE 2003gk AND 2003gl
T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that spectrograms of SN 2003gk (cf.
IAUC 8162), obtained by Challis and M. Hicken on July 3.39 UT with
the MMT 6.5-m telescope (+ Blue Channel Spectrograph; range 320-800
nm) and by M. Calkins on July 3.46 with the F. L. Whipple
Observatory 1.5-m telescope (+ FAST spectrograph; range 370-750 nm),
show it to be a type-Ib supernova a few weeks past maximum, similar
to SN 1999di (see Matheson et al. 2001, A.J. 121, 1648).
J. Sollerman, J. Andersson, M. Gustafsson, P. Jakobsson, and
G. Oye, on behalf of the NORFA/NOT Summer School in Observational
Astrophysics; and F. Patat, European Southern Observatory, report
on spectroscopy obtained with the Nordic Optical Telescope (+
ALFOSC; range 350-950 nm, resolution 0.8 nm) on July 7.2 UT. A
preliminary reduction of the spectrum of SN 2003gl (cf. IAUC 8163)
shows it to be a type-Ia supernova, a few weeks after maximum light.
SN 2003gk is probably of type Ib, though the low signal-to-noise
ratio of the data makes the classification rather uncertain; the
spectrum shows a reasonable resemblance to SN 1984L (Harkness et al.
1987, Ap.J. 317, 355), several weeks after maximum light, and the
most prominent features are tentatively identified as He I, O I,
and Ca II. The expansion velocity, deduced from the minimum of the
He I 587.6-nm absorption trough, is 8300 km/s. This relatively low
value, together with the absolute magnitude implied by the distance
[43 Mpc; v(gal) = 3192 km/s, H_o = 72 km s**-1 Mpc**-1] and the
observed magnitude at discovery (IAUC 8162), seem to confirm the
spectral dating.
(C) Copyright 2003 CBAT
2003 July 11 (8164) Daniel W. E. Green
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