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IAUC 6239: 1995ad; GRO J2058+42; P/1995 S1

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                                                  Circular No. 6239
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

SUPERNOVA 1995ad IN NGC 2139
     R. Evans, Coonabarabran, N.S.W., reports his visual discovery
of a supernova located 25" west and 5" south of the nucleus of NGC
2139 (R.A. = 6h01m.1, Decl. = -23o40', equinox 2000.0); on Sept.
28.8 UT, Evans estimated mv = 14.0-14.5, noting that nothing was
visible at this location on Aug. 25 (0.41-m reflector).
     S. Benetti, European Southern Observatory (ESO); D. Grupe,
Universitats-Sternwarte, Gottingen, report:  "Inspection of a
fully-reduced CCD spectrogram (range 390-784 nm, resolution 0.4 nm)
obtained on Sept. 29.30 UT with the ESO 1.5-m telescope (+ Boller &
Chivens spectrograph) at La Silla confirms this object as a type-II
supernova around maximum.  The spectrum consists of a broad-
symmetric (FWHM = 11000 km/s) H-alpha emission, and P-Cyg profiles
of H-delta, H-gamma, and H-beta.  The lines are superimposed on a
blue continuum (Tbb about 13 000 K).  The expansion velocity
deduced from the minima of the H lines is about 9500 km/s.  The He
I 587.6-nm line is also present with a P-Cyg profile, and it shows
a slower expansion velocity (about 8800 km/s).  The velocity shift
(1790 km/s) of a narrow H-alpha emission component is consistent
with the recession velocity of NGC 2139."

GRO J2058+42
     J. E. Grove, Naval Research Laboratory, reports on behalf of
the Compton Gamma Ray Observatory (CGRO) OSSE team:  "We have
further constrained the position for GRO J2058+42 using the OSSE
instrument on the CGRO.  Data from a 1-dimensional scan through the
source region were combined with the published BATSE error box
(IAUC 6238) to yield a new 95-percent confidence region of size
about 30' x 60', bounded by a quadrilateral with the following
vertices (equinox 2000.0):  R.A. = 21h00m.5, Decl. = +41o42';
20h59m.5, +42o12'; 20h57m.5, +41o21'; 20h58m.3, +40o51'.  Follow-up
observations in other wavebands to identify the object are

     Visual m1 estimates:  Sept. 22.29 UT, 6.3 (A. Dimai, Cortina
d'Ampezzo, Italy, 0.50-m reflector); 23.46, 6.4 (W. Dillon,
Missouri City, TX, 7x50 binoculars); 24.11, 6.2 (K. Sarneczky,
Raktanya, Hungary, 20x60 binoculars); 25.86, 6: (D.-q. Zhang,
China; independent discovery); 26.21, 5.7 (A. Pereira, Cabo Ruivo,
Portugal, 9x34 binoculars); 27.17, 5.9 (S. Baroni, Milan, Italy,
20x80 binoculars); 28.43, 5.8 (G. W. Kronk, Troy, IL, 20x80
binoculars); 29.18, 5.4 (J. D. Shanklin, Cambridge, England, naked

1995 September 29              (6239)            Daniel W. E. Green

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