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IAUC 5588: GRO J0422+32; RCW 103; 1992k

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IAUC number 

                                                  Circular No. 5588
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


GRO J0422+32
     A. J. Castro-Tirado, Danish Space Research Institute (DSRI),
Lyngby; P. Pavlenko, A. Salyapikov, and R. Gershberg, Crimean
Astrophysical Observatory, Nauchny; and V. Hayrapetyan, S. Brandt,
and N. Lund, DSRI, report:  "Using CCD images obtained at the Crimean
Astrophysical Observatory, we have identified a probable optical
counterpart for the hard x-ray transient GRO J0422+32 (IAUC
5580, 5584, 5587), located at  R.A. = 4h18m34s +/- 1s, Decl. =
+32 47'33" +/- 15" (equinox 1950.0).  No corresponding object is
found on the Palomar Sky Survey plates.  On Aug. 15.01 UT,
photometry of the candidate object yielded B = 13.25 +/- 0.3, B-V =
+0.66 +/- 0.3, V-R = +0.76 +/- 0.3.  Follow-up observations in
radio and ultraviolet are strongly encouraged."


RCW 103
     T. Aoki, T. Dotani, and K. Mistuda, Institute of Space and
Astronautical Science, Sagamihara, communicate:  "An x-ray pulsation
from the region including the galactic supernova remnant RCW 103
(cf. Rodgers et al. 1960, MNRAS 121, 103) was detected with the
large area counters aboard Ginga.  The observation was performed
during 1989 Mar. 4.9-5.5 UT, and the net observation time was about
4 hr.  Evidence of a pulsation of 69.319 ms was revealed by Fourier
power spectrum analysis.  This periodicity was confirmed by the
pulse folding technique.  The pulse profile was a single peaked
sinusoidal with an amplitude of 2.7 x 10E-4 counts sE-1 cmE-2 in
the energy range 2.3-13.8 keV.  Confirmation at other wavelengths
is encouraged."


COMET MACHHOLZ (1992k)
     Extension to ephemeris on IAUC 5562:

1992 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 16     7 28.54   + 2 10.6   1.708   1.057   35.2   33.6   10.4
     21     7 42.85   - 1 31.4   1.739   1.114   37.1   33.2   10.7
     26     7 56.55   - 5 05.7   1.774   1.175   39.0   32.7   10.9
     31     8 09.65   - 8 31.8   1.811   1.237   40.8   32.2   11.2
Sept. 5     8 22.19   -11 49.6   1.850   1.302   42.6   31.6   11.5
     10     8 34.18   -14 59.0   1.891   1.367   44.4   31.0   11.7
     15     8 45.63   -18 00.1   1.933   1.433   46.1   30.4   12.0


1992 August 15                 (5588)            Daniel W. E. Green

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