Central Bureau for Astronomical Telegrams
IAUC 7141: 1999br; 1999bs; 1995N, 1997ab
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Circular No. 7141
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 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1999br IN NGC 4900
J. Y. King, University of California at Berkeley, reports the
discovery of an apparent supernova during the course of the Lick
Observatory Supernova Search (cf. IAUC 6627, 7126) with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT). SN 1999br was
discovered and confirmed on unfiltered images taken on Apr. 12.4
and 13.2 UT (both with mag about 17.5). The new object is located
at R.A. = 13h00m41s.80, Decl. = +2o29'45".8 (equinox 2000.0), which
is about 40" east and 19" south of the nucleus of NGC 4900. A KAIT
image of the same field on Jan. 6.6 (limiting mag about 18.5) shows
nothing at the position of the supernova. There is a bright
foreground star (mag about 11.3) located 12".5 west and 15".6 south
of SN 1999br.
SUPERNOVA 1999bs IN UGC 11093
Y. L. Qiu, Q. Y. Qiao, and J. Y. Hu, Beijing Astronomical
Observatory (BAO); and S. Leung and S. Ko, Hong Kong University,
report that the discovery of an apparent supernova in UGC 11093 by
the BAO Supernova Survey with the 0.6-m telescope at Xinglong
Station. The supernova was found and confirmed on unfiltered CCD
frames taken on Apr. 12.8 and 13.9 UT (mag about 16.1 on both
dates). The new object is located at R.A. = 18h01m48s.75, Decl. =
+7o00'49".6, which is about 43" west and 164" north of the center
of UGC 11093. CCD frames taken on 1998 Sept. 22 (limiting mag
about 18.5) show no star at the position of the supernova.
SUPERNOVAE 1995N AND 1997ab
B. E. Schaefer and B. Roscherr, Yale University, report on
photometry of two type-IIn supernovae obtained with the 3.5-m WIYN
telescope on Mar. 11.6 UT: "SN 1995N has V = 19.83 and R = 19.65;
these observations were made 1406 days after peak (IAUC 6170), with
the V magnitude lower by only about 2.3 mag (for an average decline
rate of 0.16 mag per 100 days). SN 1997ab has B = 20.78, V =
20.36, and R = 19.46 (cf. IAUC 7058); these observations were made
1064 days after the peak, with an average decline rate of 0.57 mag
per 100 days. Galaxy subtraction uncertainties are of order 0.1
mag. Both sources offer an opportunity to view supernovae at
reasonable brightnesses at extremely late times."
(C) Copyright 1999 CBAT
1999 April 14 (7141) Daniel W. E. Green
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