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IAUC 5554: 1992ae, 1992af; PSR 1706-44; 1991a1

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IAUC number

                                                  Circular No. 5554
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

SUPERNOVAE 1992ae AND 1992af
     L. Wells, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report the discoveries by R. Antezana (University
of Chile) of two apparent supernovae on unfiltered 20-min IIaO
exposures taken by L. Wells with the CTIO Curtis Schmidt telescope.
SN 1992ae, at mpg about 18 on June 27.30 UT, is located 3"
east and 5" north of the nucleus of an anonymous galaxy (R.A. =
21h24m26s.8, Decl. = -61 46'12", equinox 1950.0).  SN 1992af, at
mpg about 17.5 on June 29.28, is located 10" east and 3" south of
the nucleus of the spiral galaxy ESO 340-G38 (R.A. = 20h27m17s.0,
Decl. = -42 28'39").  Confirmation of both SNe 1992ae and 1992af
was made by K. Wakamatsu (Gifu University) and M. Malkan (University
of California, Los Angeles) from B and V CCD images obtained
on July 2.31-2.32 with the CTIO 0.9-m telescope, and by C. Anguita
(University of Chile) from B and V images obtained on July 2.32-
2.33 at the CTIO 1.5-m telescope.

PSR 1706-44
     W. Becker, P. Predehl, and J. Trumper, Max-Planck-Institut fur
Extraterrestrische Physik; and H. Ogelman, University of Wisconsin,
communicate:  "We report the detection of the pulsar PSR 1706-44 in
soft x-rays with the ROSAT satellite during an observation of 3400
s on 1992 Feb. 24 and 25.  This pulsar was recently detected as a
gamma-ray source above 100 MeV (Kniffen et al., IAUC 5485).  The
ROSAT PSPC count rate of PSR 1706-44 is 0.037 +/- 0.003 counts/s.
The detected photons are above 0.6 keV, indicating a hard and
absorbed spectrum.  The observed flux at the satellite in the 0.1- to
2.4-keV band is about 4 x 10E-13 erg cmE-2 sE-1.  A search for
pulsations at the radio period gave a 90-percent confidence upper
limit of 0.4 for the pulsed fraction.  This source is rescheduled for
ROSAT observations on Sept. 22-25."

     Selected total visual magnitude estimates:  June 11.30 UT, 9.1
(J. E. Bortle, Stormville, NY, 0.32-m reflector); 20.97, 9.4 (J.
Shanklin, Cambridge, England, 0.2-m refractor); 28.25, 8.2 (G. W.
Kronk, Troy, IL, 20x80 binoculars); July 2.13, 7.9 (Bortle, 10x50
binoculars); 2.18, 8.5 (A. Hale, Las Cruces, NM, 10x50 binoculars).

1992 July 3                    (5554)            Daniel W. E. Green

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