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IAUC 7156: 1999by; 1999bg; 1999bx

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                                                  Circular No. 7156
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999by IN NGC 2841
     A new apparent supernova has been reported independently by R.
Arbour, South Wonston, Hampshire, England, and by the Lick
Observatory Supernova Search (LOSS; cf. IAUC 6627, 7126).  On
behalf of LOSS, M. Papenkova, W. D. Li, and A. V. Filippenko,
University of California at Berkeley, report that SN 1999by was
found and confirmed on unfiltered CCD images taken with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT) on Apr. 30.2 (mag about
15.7) and May 1.2 UT (mag about 15.0).  Arbour's unfiltered CCD
discovery image (limiting mag about 17.5), taken on Apr. 30.8749
with a 0.3-m f/6.3 Schmidt-Cassegrain reflector in the course of
his supernova patrol, yields an estimate of the new star's
magnitude to be 15.1 and its offset to be 96" west and 86" north of
the center of NGC 2841.  Arbour forwards the following position
obtained by M. Armstrong from an image obtained on Apr. 30.904:
R.A. = 9h21m52s.07, Decl. = +51o00'06".6 (equinox 2000.0).
Papenkova et al. provide position end figures 52s.18, 07".2, which
is about 100" west and 91" north of the galaxy nucleus; they add
that there is a bright star (mag about 11.1) located 11".7 west
and 29".5 north of the supernova.  A KAIT image of the same field
on Apr. 25.2 (limiting mag about 19.3) showed nothing at the
position of the new star.  Arbour found a prediscovery image taken
on Apr. 28.8786 that shows SN 1999by at mag about 16.0-16.5, though
the supernova was not visible on images taken on Apr. 10, 14, 22,
23, or 27 (limiting mag about 17.5).  Papenkova et al. note that
NGC 2841 is a well-known Sb galaxy and the host of three past
supernovae (1912A, 1957A, 1972R), and they urge spectroscopic and
photometric observations for this early and potentially bright

SUPERNOVA 1999bg IN IC 758
     Additional CCD magnitude estimates, unfiltered unless noted
otherwise (cf. IAUC 7143):  Apr. 19.030 UT, V = 15.85 (D. Hanzl,
Brno, Czech Republic); 19.049, R = 15.43 (Hanzl); 29.531, 15.6 (S.
Yoshida and K. Kadota, Ageo City, Japan); 29.808, R = 15.4 (Hanzl);
30.030, V = 15.85 +/- 0.14 (Hanzl).

SUPERNOVA 1999bx IN NGC 6745
     Note that the host galaxy of SN 1999bx is NGC 6745 = UGC 11391
(cf. IAUC 7154).

                      (C) Copyright 1999 CBAT
1999 May 1                     (7156)            Daniel W. E. Green

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