Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6241: 1995ae; GRO J1750-27

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6240 SEARCH Read IAUC 6242

View IAUC 6241 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 6241
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1995ae IN ANONYMOUS GALAXY
     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

Read IAUC 6240 SEARCH Read IAUC 6242

View IAUC 6241 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!