Central Bureau for Astronomical Telegrams
IAUC 7566: 2001L; 2001D, 2001E,, 2001J
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Circular No. 7566
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2001L IN MCG -01-30-11
A. Friedman, W. D. Li, and R. Chornock, University of
California at Berkeley, report the discovery by LOTOSS (cf. IAUC
7514) of a supernova (mag about 15.4) on an unfiltered image taken
on Jan. 18.4 UT (and confirmed at mag about 15.7 on an earlier
image taken on 2000 Dec. 31.4) with the 0.8-m Katzman Automatic
Imaging Telescope. SN 2001L is located at R.A. = 11h36m48s.83,
Decl. = -8 35'07".0 (equinox 2000.0), which is 0".3 east and 3".8
north of the nucleus of MCG -01-30-11. A KAIT image taken on 2000
Dec. 23.4 showed nothing at this position (limiting mag about 19.0).
S. Jha, T. Matheson, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001L, obtained by M. Calkins on Jan. 19.46 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
identifies it as a type-Ia supernova about 1 week after maximum
brightness. With the NASA/IPAC Extragalactic Database recession
velocity for the host galaxy of 4567 km/s, the expansion velocity
of the supernova is 9400 km/s, measured using the Si II (rest 635.5
nm) feature. The spectral-feature age (Riess et al. 1997, A.J.
114, 722) of the supernova is 8 +/- 2 days after maximum light.
SUPERNOVAE 2001D, 2001E, AND 2001J
Jha et al. also report that a spectrum of SN 2001D (cf. IAUC
7557), obtained as above on Jan. 19.47 UT, shows it to be a type-II
supernova at or just after maximum light. The spectrum exhibits a
slightly blue continuum with well-developed P-Cyg Balmer and He I
lines. The expansion velocity of the supernova, measured using the
H-alpha profile, is 10 100 km/s, where the recession velocity of IC
728 was measured to be 8500 km/s from narrow, superimposed H-alpha
emission. A spectrum of SN 2001E (cf. IAUC 7557), taken as above
on Jan. 19.49, indicates it to be a type-Ia supernova at maximum
light. Superimposed, narrow H-alpha emission provides a recession
velocity for NGC 3905 of 5790 km/s, implying an expansion velocity
for the supernova of 14 200 km/s, measured via the strong Si II
(rest 635.5 nm) profile. The spectral-feature age of the supernova
is 0 +/- 2 days after maximum light. A spectrum of SN 2001J (cf.
IAUC 7564), taken as above on Jan. 19.45, shows it to be a type-II
supernova at maximum light. The spectrum features a flat continuum
with broad H-alpha, H-beta, and He I profiles. The expansion
velocity based on the H-alpha profile is 13 000 km/s, using a
recession velocity for UGC 4729 of 3860 km/s, as measured from
narrow, superimposed H-alpha emission.
(C) Copyright 2001 CBAT
2001 January 19 (7566) Daniel W. E. Green
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