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IAUC 7309: 1999ew; GRS 1915+105; C/1999 S3

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                                                  Circular No. 7309
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1999ew IN NGC 3677
     M. Modjaz and W. D. Li, University of California at Berkeley,
on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627,
7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of an apparent supernova on unfiltered CCD
images taken on Nov. 13.5 and 14.5 UT, both showing magnitude about
16.5.  SN 1999ew is located at R.A. = 11h26m17s.66, Decl. =
+46o58'32".7 (equinox 2000.0), which is 0".3 west and 6".1 north of
the nucleus of NGC 3677.  A KAIT image of the same field on May
23.3 (limiting mag about 19.0) showed nothing at the position of SN
1999ew.
     P. Garnavich, R. Kirshner, and S. Jha, Harvard-Smithsonian
Center for Astrophysics; and J. Tonry, University of Hawaii (UH),
report:  "A spectrum (range 550-800 nm) of SN 1999ew, obtained on
Nov. 14.6 UT with the Keck II telescope (+ LRIS), shows this to be
a type-II supernova, at or before maximum light.  The spectrum
displays broad H-alpha and He I 587.5-nm features with P-Cyg
profiles.  The continuum rises steeply into the blue.  The
photospheric expansion velocity, measured from the minimum of the
H-alpha absorption, is 11 500 km/s.  CCD imaging with the UH 2.5-m
telescope, obtained simultaneously with the spectroscopy, provides
magnitudes V about 17.2, R about 16.9.  The redshift of NGC 3677
and the early phase at discovery of SN 1999ew makes it an excellent
supernova for application of the Expanding Photosphere Method
(Eastman et al. 1996, Ap.J. 466, 911)."


GRS 1915+105
     E. B. Waltman, Naval Research Laboratory; and F. D. Ghigo,
National Radio Astronomy Observatory, report:  "The Green Bank
Interferometer (GBI) has observed a flare in the microquasar GRS
1915+105 on Nov. 14.  Flux densities reached 0.4 Jy at 2 GHz on
Nov. 15.0 UT.   The data are in the public domain and may be
accessed via the GBI web page at http://www.gb.nrao.edu."


COMET C/1999 S3 (LINEAR)
     Visual m_1 estimates:  Oct. 29.77 UT, 12.1 (M. Meyer,
Frauenstein, Germany, 0.25-m reflector); Nov. 2.30, 12.4 (N. Biver,
Oahu, HI, 0.26-m reflector); 6.58, 11.1 (S. Yoshida, Ibaraki,
Japan, 0.25-m reflector); 13.45, 11.5 (Y. Nagai, Yamanashi, Japan,
0.32-m reflector).

                      (C) Copyright 1999 CBAT
1999 November 15               (7309)            Daniel W. E. Green

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