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IAUC 7319: 1999gd; 1999ga; HD 209458; NOTICE TO SUBSCRIBERS

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                                                  Circular No. 7319
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 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1999gd IN NGC 2623
     W. D. Li, University of California at Berkeley, on behalf of the Lick
Observatory Supernova Search (cf. IAUC 6627, 7126) with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT), reports the discovery of an apparent
supernova in NGC 2623.  The supernova was discovered and confirmed on
unfiltered images taken on Nov. 24.5 (mag about 17.8) and 25.6 UT (mag about
17.4), respectively.  The new object is located at R.A. = 8h38m24s.61,
Decl.= +25d45'33".1 (equinox 2000.0), which is 7".3 east and 17".4 north of
the nucleus of NGC 2623.  KAIT images of the same field on Nov. 22.5
(limiting mag about 18.0) and Nov. 5.5 (limiting mag about 19.0) showed
nothing at the position of the supernova.

SUPERNOVA 1999ga IN NGC 2442
     E. P. Rubenstein, Cerro Tololo Interamerican Observatory, reports
V = 17.1 +/- 0.1 from CCD images obtained at the 0.9-m telescope under
photometric conditions on Nov. 25.1835 UT.  He adds: "The B, R and I
magnitudes were also measured to be 18.3 +/- 0.3, 16.2 +/- 0.1 and 15.6 +/- 0.1,
respectively.  It appears that this supernova is embedded in the galaxy's
dust lanes.  In addition, the supernova's red color suggests significant
interstellar reddening.  Spectroscopic follow-up should be made to
determine if this is a type-II supernova, as is suggested by its location."

HD 209458
     Further to the note on IAUC 7317, G. Gonzalez points out that the
use of the two comparison stars permitted the calculation of an rms Delta m
for HD 209458 of 0.0065 mag prior to the start of the transit and that the
magnitude difference between the comparison stars remained constant during
the run to within the measurement errors.  Ingress exterior contact was
observed at the time stated, but the star's low altitude did not allow
detection of interior contact with confidence, and it is estimated that the
dimming was no more than 0.028 mag.  An 8-nm-wide filter was used.

     Owing to a change in the accounting procedures at the Smithsonian
Astrophysical Observatory, subscribers are advised that, beginning in
December, payments should be made by mid-month, in order to guarantee their
inclusion in the end-of-month accounting run.

                      (C) Copyright 1999 CBAT
1999 November 26               (7319)              Brian G. Marsden

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