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IAUC 8518: Var OBJECT IN Boo; 2005bt; C/2003 T4

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                                                  Circular No. 8518
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Further to IAUC 8515, T. Puckett and E. Briggs report the
discovery of a variable object (mag 16.0) on an unfiltered CCD
frame taken with the 0.50-m automated supernova patrol telescope on
Apr. 20.25 and 21.21 UT.  The new object is located at R.A. =
14h54m20s.91, Decl. = +16o24'23".8 (equinox 2000.0), which is 37"
west and 184" north of the center of IC 4516, and it was also
visible at mag 17.6 on Puckett's images from Apr. 5.  Nothing is
visible at this location on images taken by Puckett on 2002 Feb. 13
and 2003 Mar. 15 (limiting mag about 20.0), but a faint, starlike
object is visible at this location on Palomar Sky Survey plates
taken on 1993 Mar. 23 (blue mag 18.6) and 1991 May 16 (red mag
19.4).  H. Yamaoka, Kyushu University, reports a confirmation of
this object on an unfiltered CCD image taken by K. Itagaki (Teppo-
cho, Yamagata, Japan; 0.60-m telescope) at red mag 15.9 on Apr.
21.577, providing position end figures 20s.85, 24".4.  Yamaoka adds
that this appears to be 3C 306 (possibly a quasar), with the
location being very close to a dumbbell-shaped radio source in the
NVSS and FIRST catalogues; it also appears to be listed in the
USNO-B1.0 catalogue (with position end figures 20s.85, 24".7) as
having red mag 19.9.

SUPERNOVA 2005bt IN UGC 8205
     Further to IAUC 8476, O. Trondal, P. Holvorcem, and M.
Schwartz report their discovery of an apparent supernova (mag about
18.0) on unfiltered Tenagra II 0.81-m telescope images taken on Apr.
20.40 and 21.27 UT.  SN 2005bt is located at R.A. = 13h07m13s.07,
Decl. = +58o08'08".4 (equinox 2000.0), which is 4".4 west and 2".2
north of the nucleus of UGC 8205.  Nothing was visible at this
position in earlier images taken by T. Boles on 2003 May 25.96
(0.35-m reflector; limiting mag about 19.0) and W. Li on 2002 June
19.22 (KAIT; limiting mag about 19.0).  T. Puckett provides the
following unfiltered CCD magnitudes for SN 2005bt:  2002 Apr. 18,
[20; 2003 Apr. 12, [20; 2005 Mar. 19, 18.4; Apr. 17, 18.0; 21, 18.0.

     Total visual magnitude estimates:  Mar. 10.22 UT, 8.4 (J. J.
Gonzalez, Leon, Spain, 7x50 binoculars); 17.14, 7.9 (K. Hornoch,
Lelekovice, Czech Republic, 10x80 binoculars); Apr. 2.86, 8.0 (A.
Pearce, Noble Falls, W. Australia, 20x80 binoculars); 17.77, 8.1
(D. A. J. Seargent, The Entrance, N.S.W., 10x50 binoculars).

                      (C) Copyright 2005 CBAT
2005 April 21                  (8518)            Daniel W. E. Green

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