IAU Central Bureau for Astronomical Telegrams

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IAUC 8503: 2005az; 2005ba; 2005al, 2005au

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IAUC number


                                                  Circular No. 8503
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 2005az IN NGC 4960
     R. Quimby, P. Mondol, P. Hoeflich, and J. C. Wheeler,
University of Texas; and C. Gerardy, Imperial College, report the
discovery of an apparent supernova in unfiltered CCD images taken
on Mar. 28.21 (at mag about 17.4) and 31.45 UT (mag about 16.9)
using the 0.45-m 'ROTSE-IIIb' telescope at the McDonald Observatory.
The new object is located at R.A. = 13h05m46s.97, Decl. =
+27o44'08".4 (equinox 2000.0), which is 8".0 west and 5".5 north of
the center of NGC 4960.  A co-addition of ROTSE-IIIb images taken
between 2004 Dec. 15 and 2005 Jan. 14 (limiting mag about 18.6)
shows nothing at this position.  The new source is not present on
ROTSE-IIIb images taken on Mar. 20.23 (limiting mag about 17.4).


SUPERNOVA 2005ba IN NGC 3746
     S. Kildahl, Hokksund, Norway, reports the discovery by A.
Danielsen (Langhus, Norway), M. Steine (Blaker, Norway), and
himself of an apparent supernova (mag about 17.5) on unfiltered
images taken with a 'Celestron 14' reflector at Veggli, Norway,
on Apr. 1.92, 2.84, and 3.062 UT.  The new object is located at
R.A. = 11h37m42s.58, Decl. = +22o00'38".9 (equinox 2000.0), which
is 14".6 west and 4".0 north of the nucleus of NGC 3746.  SN 2005ba
was not detected in an earlier image taken by O. Trondal with the
Tenagra II 0.81-m telescope on 2004 Dec. 12.38 (limiting mag about
19.0).


SUPERNOVAE 2005al AND 2005au
     M. Salvo and B. Schmidt, Australian National University (ANU);
and J. Christiansen, University of New South Wales, write that a
spectrum (range 407-570 nm) of SN 2005al (cf. IAUC 8488), taken
with the ANU 2.3-m telescope (+ Double-Beam Spectrograph) at Siding
Spring Observatory on Feb. 28.59 UT, shows it to be a type-Ia
supernova around maximum light.
     M. Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian
Center for Astrophysics; and T. Matheson, National Optical
Astronomy Observatory, report that a spectrogram (range 350-740 nm)
of SN 2005au (cf. IAUC 8496), obtained by P. Nutzman on Mar. 31.27
UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST),
shows it to be a type-II supernova, probably within a few weeks
past explosion.  The spectrum consists of a blue continuum and
P-Cyg lines of H_alpha and H_beta.  Adopting the NED recession
velocity of 5592 km/s for the host galaxy, the expansion velocity
derived from the minimum of the H_beta line is about 9000 km/s.

                      (C) Copyright 2005 CBAT
2005 April 3                   (8503)            Daniel W. E. Green

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