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IAUC 6241: 1995ae; GRO J1750-27

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                                                  Circular No. 6241
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)

     C. Pollas, Observatoire de la Cote d'Azur (OCA), reports his
discovery of a supernova (V = 18.5) on two Technical Pan films
obtained on Sept. 22.97 and 27.03 UT by D. Albanese and himself
with the OCA Schmidt telescope; the supernova is located at R.A. =
23h16m55s.65, Decl. = -2o04'36".4 (equinox 2000.0), which is 5".4
west and 0".5 north of the galaxy's center (the galaxy itself being
of mag B about 17.0).  Nothing is visible at this location on the
Palomar Sky Survey prints or the Digital Sky Survey.  A nearby star
(V about 15) has position end figures 17m02s.55, 05'28".9.
     S. Benetti, European Southern Observatory (ESO), reports:
"Inspection of a fully-reduced CCD spectrogram (range 374-690 nm,
resolution 1.5 nm), obtained on Oct. 1.05 UT with the ESO 3.6-m
telescope (+ EFOSC1) at La Silla, confirms this object as a type-Ia
supernova about 10 days after maximum.  The spectrum is dominated
by strong emission lines measured at 421.2, 448.1, 491.6, 527.0,
and 560.3 nm.  The S II 565.4-nm line is still present (absorption
measured at 583.5 nm).  From the Si II 635.5-nm absorption line
(measured at 657.0 nm), an expansion velocity of about 9850 km/s is
derived (the redshift of the parent galaxy being 20 670 km/s, as
measured from the interstellar Na D absorption blend, present in
the supernova's spectrum)."

GRO J1750-27
     T. Dotani, R. Fujimoto, F. Nagase, and H. Inoue, Institute of
Space and Astronautical Science, on behalf of the ASCA team,
communicates:  "We observed the region of GRO J1750-27 (cf. IAUC
6222) with ASCA between Sept. 25.36 and 26.05 UT.  The pulsar was
detected near the edge of ASCA's GIS field-of-view (and outside the
SIS field-of-view), near the northwest corner of the BATSE error
box (source position R.A. = 17h49m12s.0, Decl. = -26o38'50";
equinox 2000.0; uncertainty radius 2').  The average x-ray flux of
the source was 6 x 10E-10 erg cmE-2 sE-1 in the band 2-10 keV.  We
detected clear pulsation with a period of 4.452 +/- 0.006 s
(corrected for the solar-system barycenter), which confirms the
source to be GRO J1750-27.  The energy spectrum is approximated by
a power law with a photon index of 0.8 and an absorption column of
2 x 10E22 cmE-2."

1995 October 2                 (6241)            Daniel W. E. Green

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