Central Bureau for Astronomical Telegrams
IAUC 7592: 2001Y; 2001Z; V4334 Sgr
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Circular No. 7592
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)
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URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVA 2001Y IN NGC 3362
W. D. Li and M. Modjaz, University of California at Berkeley
(UCB), on behalf of LOTOSS (cf. IAUC 7514), report the discovery of
a supernova (mag about 18.1) on unfiltered images taken on Mar.
3.34 and 3.47 UT with the 0.8-m Katzman Automatic Imaging Telescope
(KAIT). SN 2001Y is located at R.A. = 10h44m50s.42, Decl. =
+6 35'50".8 (equinox 2000.0), which is 18".0 west and 2".3 north of
the nucleus of NGC 3362. SN 2001Y was confirmed at about the same
brightness on an unfiltered image taken by M. Schwartz on Mar. 4.2
with the Tenagra Observatory 0.5-m automatic telescope. Images of
the same field taken with the Tenagra 0.5-m telescope on Feb. 19.3
(limiting mag about 18.5) and with KAIT on 1999 Apr. 10.3 (limiting
mag about 19.5) showed nothing at this position. R. Chornock
(UCB), Li, and A. V. Filippenko (UCB) obtained a noisy spectrum of
SN 2001Y with the Lick Observatory Shane 3-m telescope on Mar. 3.5
under poor conditions. The spectrum is featureless with a very
blue continuum, suggesting that SN 2001Y is a type-II supernova
before maximum light.
SUPERNOVA 2001Z IN IC 3528
Modjaz and Li also report the LOTOSS discovery of another
apparent supernova (mag about 18.3) on an unfiltered image taken
with KAIT on Mar. 3.5 UT. SN 2001Z is located at R.A. =
12h34m55s.87, Decl. = +15o34'07".5 (equinox 2000.0), which is 0".5
west and 11".2 north of the nucleus of IC 3528. The new object was
confirmed (mag about 18.5) on an unfiltered image taken by Schwartz
on Mar. 4.4 with the Tenagra 0.5-m telescope. A KAIT image of the
same field taken on Feb. 6.4 showed nothing at the position of the
new object (limiting mag about 19.5).
V4334 SAGITTARII
C. Lederle and S. Kimeswenger, University of Innsbruck, write:
"Near-infrared photometry of V4334 Sgr obtained on Feb. 18.39 UT at
the European Southern Observatory 1-m telescope (+ DENIS) yields
magnitudes I > 18, J = 12.61, K = 6.24. This brightening from the
deep minimum in summer 2000 (J > 15, K > 7; P. Whitelock, priv.
comm.) either indicates an unexpected early opening from the strong
circumstellar dust envelope or a renewal of the wind lines of He in
the J band. Near-infrared spectroscopic follow-up is strongly
encouraged."
(C) Copyright 2001 CBAT
2001 March 4 (7592) Daniel W. E. Green
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