Central Bureau for Astronomical Telegrams
IAUC 7732: 2001ev; 2001en
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Circular No. 7732
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 2001ev IN UGC 2653
M. Papenkova and W. D. Li, University of California at
Berkeley, report the discovery by LOTOSS (cf. IAUC 7514) of an
apparent supernova (mag about 18.8) in unfiltered images taken with
the Katzman Automatic Imaging Telescope (KAIT) on Oct. 11.5 and
12.3 UT. SN 2001ev is located at R.A. = 3h18m39s.04, Decl. =
+37o36'31".8 (equinox 2000.0), which is 8".6 east and 2".5 north of
the nucleus of UGC 2653. KAIT images taken on Sept. 15.5 (limiting
mag about 19.8) and 29.5 (limiting mag about 19.0) showed nothing
at this position.
SUPERNOVA 2001en IN NGC 523
G. H. Marion, P. Hoeflich, and J. C. Wheeler, University of
Texas at Austin; and W. Vacca, Max-Planck-Institut fuer
Extraterrestrische Physik, write: "SN 2001en (IAUC 7724, 7725) is a
type-Ia supernova near maximum light. Near-infrared spectra (range
800-2500 nm) of SN 2001en were obtained on Oct. 8.4 UT using the
SpeX instrument at the Infrared Telescope Facility (IRTF). The
development of features in the supernova spectra places it
temporally between other type-Ia spectra obtained with SpeX at the
IRTF: SN 2001br at -2 days (with respect to maximum) and SN 2001dl
at +3 days. The spectra of SN 2001en do not show the evolved
features shown by type-Ia supernova 2001bg at +10 days. According
to W. D. Li, University of California at Berkeley, SN 2001en has
brightened from mag 17.0 on Sept. 27.3 to mag 15.0 on Oct. 9.3, and
its blue color and brightness are consistent with a type-Ia event
in NGC 523."
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2001en, obtained by J. Huchra on Oct. 11.38 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova at maximum light.
Adopting the NASA/IPAC Extragalactic Database recession velocity of
4758 km/s for the host galaxy, the supernova expansion velocity is
about 12 400 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 0 +/- 2
days after maximum light.
A. Dimai and M. Migliardi, Cortina d'Ampezzo, Italy, report
that SN 2001en appeared at mag 16.7 on an unfiltered CCD frame
(limiting mag 18.5) taken in the course of the CROSS program (cf.
IAUC 7373) on Sept. 26.94 UT. Nothing was visible on CROSS images
taken on Aug. 27.01 (limiting mag 18.5).
(C) Copyright 2001 CBAT
2001 October 12 (7732) Daniel W. E. Green
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