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IAUC 7195: GRS 1915+105; 1999cm; C/1999 H3

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                                                  Circular No. 7195
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)


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 June 8.  Flux densities peaked near 0.5 Jy at 2 GHz on
June 8.3 UT and were declining from 0.25 Jy at 8 GHz.  The data are
in the public domain and may be accessed via the GBI web page at
http://www.gb.nrao.edu."


SUPERNOVA 1999cm IN UGC 9766
     S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
1999cm (cf. IAUC 7190) was obtained by P. Berlind on June 8.2 UT
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST
spectrograph) and reveals it to be a type-Ia supernova at maximum
light.  Cross-correlation of the host galaxy spectrum with
absorption and emission-line templates yields a recession velocity
of 13 570 km/s for UGC 9766.  The photospheric expansion velocity
derived from Si II (rest 635.5 nm) is 10 100 km/s.  The age of the
supernova  derived from the spectral features is 1 +/- 3 days after
B maximum.


COMET C/1999 H3 (LINEAR)
     Ephemeris extension to IAUC 7152 (elements MPEC 1999-L11):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 11    17 07.61   +57 54.7   3.252   3.556   99.0   16.4   13.1
     21    16 29.13   +57 56.8   3.277   3.541   96.6   16.6   13.1
July  1    15 53.83   +56 51.8   3.328   3.528   92.8   16.7   13.1
     11    15 24.42   +54 55.8   3.401   3.518   88.1   16.8   13.1
     21    15 01.68   +52 27.9   3.491   3.510   82.7   16.7   13.2
     31    14 45.03   +49 44.8   3.591   3.504   77.0   16.4   13.2
Aug. 10    14 33.39   +46 58.7   3.696   3.501   71.1   15.9   13.3
     20    14 25.71   +44 17.5   3.801   3.500   65.2   15.2   13.3
     30    14 21.05   +41 46.1   3.901   3.502   59.7   14.4   13.4

     Visual m_1 estimates:  May 22.03 UT, 13.4 (M. Lehky, Hradec
Kralove, Czech Republic, 0.42-m reflector); 24.89, 12.9 (W.
Hasubick, Buchloe, Germany, 0.44-m reflector); June 3.89, 13.6 (K.
Hornoch, Lelekovice, Czech Republic, 0.35-m reflector); 4.98, 12.2
(J. Carvajal, Madrid, Spain, 0.32-m reflector); 7.94, 13.0 (M.
Reszelski, Szamotuly, Poland, 0.25-m reflector).

                      (C) Copyright 1999 CBAT
1999 June 8                    (7195)            Daniel W. E. Green

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