Central Bureau for Astronomical Telegrams
IAUC 7563: 2001I; 2001B, 2001C, 2001F,, 2001H
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Circular No. 7563
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 2001I IN UGC 2836
S. Beckmann and W. D. Li, University of California at Berkeley,
on behalf of LOTOSS (cf. IAUC 7514), report the discovery with the
0.8-m Katzman Automatic Imaging Telescope (KAIT) of an apparent
supernova (mag about 17.2) on an unfiltered image taken on Jan.
15.2 UT. The new object was confirmed on earlier images taken on
2000 Dec. 23.2 (mag about 18.4) and 28.3 UT (mag about 17.7). SN
2001I is located at R.A. = 3h43m57s.28, Decl. = +39o17'39".4
(equinox 2000.0), which is 4".1 east and 2".5 south of the nucleus
of UGC 2836. A KAIT image of the same field taken on 2000 Dec. 3.3
showed nothing at this position (limiting mag about 19.5).
SUPERNOVAE 2001B, 2001C, 2001F, AND 2001H
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that spectra of SN
2001B (cf. IAUC 7555), obtained by M. Calkins on Jan. 14.18 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova near maximum light. The
spectrum consists of a blue continuum with well-defined Si II and
Ca II features. Adopting the NASA/IPAC Extragalactic Database
(NED) recession velocity of 1556 km/s for the host galaxy, the
supernova expansion velocity is 7400 km/s for Si II (rest 635.5 nm).
The spectral-feature age of the supernova (Riess et al. 1997, A.J.
114, 722) is 9 +/- 2 days after maximum light.
Matheson et al. add that spectra of SN 2001C (cf. IAUC 7555),
obtained by Calkins (as above) on Jan. 14.20 UT, shows it to be a
type-Ia supernova several days past maximum light. The spectrum
consists of a continuum with well-defined Si II and Ca II features.
Adopting the NED recession velocity of 3280 km/s for PGC 19975, the
supernova expansion velocity is 10 200 km/s for Si II (rest 635.5
nm). The spectral-feature age of the supernova is 13 +/- 2 days
after maximum light.
Matheson et al. also report that spectra of SN 2001F (cf. IAUC
7558), obtained by Calkins on Jan. 14.53 UT, shows it to be a
type-Ia supernova several weeks past maximum light. The spectrum
consists of nebular emission lines of iron and cobalt. They also
note that spectra of SN 2001H (cf. IAUC 7560), obtained by Calkins
on Jan. 14.16 UT, shows it to be a type-II supernova before maximum
light. The spectrum consists of an almost-featureless blue
continuum with incipient P-Cyg lines of hydrogen.
(C) Copyright 2001 CBAT
2001 January 15 (7563) Daniel W. E. Green
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