Central Bureau for Astronomical Telegrams
IAUC 8260: 2003lb, 2003lc,, 2003ld
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Circular No. 8260
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)
SUPERNOVAE 2003lb, 2003lc, AND 2003ld
Additional apparent supernovae have been reported from CCD
images: SN 2003lb in UGC 2850 by M. Ory (Delemont, Switzerland,
0.61-m reflector), and SN 2003lc in UGC 934 and SN 2003ld in UGC
148 by T. Puckett and L. Cox (cf. IAUC 8225; 0.50-m reflector).
SN 2003 UT R.A. (2000.0) Decl. Mag. Offset
2003lb Dec. 25.817 3 45 05.67 +20 45 39.3 15.8 8".6 E, 3".9 S
2003lc Dec. 26.03 1 23 25.82 +30 47 14.9 17.0 32".1 W, 10".7 N
2003ld Dec. 28.02 0 15 51.85 +16 05 21.6 16.8 8".6 E, 1".3 S
Ory notes that SN 2003lb was at mag R = 16.1 on an image taken on
Dec. 26.767 UT, adding that nothing is visible at the location of
SN 2003lb on a red Palomar Sky Survey plate from 1951 Dec. 1 or a
U.K. Schmidt Telescope plate from 1991 Oct. 13. SNe 2003lc and
2003ld were confirmed on CCD frames taken by Puckett on Dec. 27.15
and 29.15, respectively, but both new objects were absent from his
images taken during 1998-2002.
C. L. Gerardy, University of Texas at Austin, reports that a
low-resolution optical spectrogram (resolution 600; range 420-950
nm) of SN 2003lb, obtained on Dec. 27.23 UT with the 2.7-m Harlan
J. Smith Telescope (+ LCS spectrograph) at McDonald Observatory,
shows it to be a type-Ia supernova near maximum light; adopting the
5425 km/s redshift of UGC 2850 from the NASA/IPAC Extragalactic
Database (NED), the expansion velocity of the Si II feature (rest
wavelength 635.5 nm) is 12400 km/s. M. Salvo, Australian National
University and Mt. Stromlo Observatory, also reports that a
spectrogram (useful range 370-610 nm) of SN 2003lb, taken in rather
poor observing conditions with the 2.3-m telescope (+ Double Beam
Spectrograph) on Dec. 27.5, shows it to be a type-Ia supernova
around maximum light.
T. Matheson, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum (range 370-750 nm)
of SN 2003lc, obtained by P. Berlind on Dec. 28.12 UT with the Mt.
Hopkins 1.5-m telescope (+ FAST spectrograph), shows it to be a
type-Ia supernova near maximum. Adopting the NED recession
velocity of 10494 km/s for the host galaxy, the supernova expansion
velocity is 10100 km/s for Si II (rest 635.5 nm). The spectral-
feature age of the supernova is 4 +/- 2 days after maximum light.
(C) Copyright 2003 CBAT
2003 December 29 (8260) Daniel W. E. Green
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