Central Bureau for Astronomical Telegrams
IAUC 3961: 4U 1323-62; 1984f; 1983s
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Circular No. 3961
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
4U 1323-62
M. van der Klis and J. van Paradijs, Astronomical Institute,
Amsterdam; F. A. Jansen, Royal Observatory, Leiden; and W. H. G.
Lewin, Massachusetts Institute of Technology, write: "We have
observed for the first time a type-I x-ray burst from the region of
4U 1323-62. The burst was detected with both the medium-energy
instrument and the GSPC onboard EXOSAT on Feb. 11.781 UT during a
4.7-hr observation. It had a risetime of 10-20 s and reached a
peak flux of roughly 50 ufu (uncorrected for aspect). The decay
initially took place on a timescale of ~ 20 s and slowed to ~ 150
s near the end of the burst. The total duration of the phenomenon
was ~ 350 s. These values apply to the integrated flux in the 1-
10-keV band: at energies above 7 keV the duration of the burst was
significantly shorter. The burst was not evident in the low-
energy telescope, nor did we see a low-energy source inside either
the 4U or the 3A error boxes of 4U 1323-62, possibly due to large
interstellar absorption to the source. However, the burst source
must be located within 45' of the center (R.A. = 13h23m, Decl. =
-61deg48', equinox 1950.0) of the field of view of the medium-energy
instrument, and that makes the identification with 4U 1323-62 very
likely. Optical observations of the field of 4U 1323-62 are urged."
COMET SHOEMAKER (1984f)
Ephemeris continuation from the elements on MPC 8902:
1984 ET R.A. (1950.0) Decl. p r m1
July 19 15 40.61 + 9 01.8 4.385 4.849 14.1
29 15 33.49 + 7 32.9
Aug. 8 15 27.99 + 5 59.2 4.547 4.701 14.0
18 15 24.07 + 4 22.9
28 15 21.66 + 2 45.7 4.730 4.555 14.0
Sept. 7 15 20.64 + 1 08.8
17 15 20.86 - 0 26.9 4.892 4.409 13.9
27 15 22.18 - 2 00.8
Oct. 7 15 24.46 - 3 32.8 4.998 4.264 13.8
PERIODIC COMET WILD 2 (1983s)
Total visual magnitude estimates by C. S. Morris, Whitaker
Peak, CA (0.25-m reflector): Apr. 21.22 UT, 13.0; 23.21, 13.1.
1984 July 20 (3961) Brian G. Marsden
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