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IAUC 5647: GX 339-4; JUPITER; N Sgr 1992 No. 2; N Sgr 1992 No. 3

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                                                  Circular No. 5647
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)


GX 339-4
     B. A. Harmon, G. J. Fishman, W. S. Paciesas, and M. Finger,
Marshall Space Flight Center, NASA, report for the Burst and
Transient Source Experiment (BATSE)/Compton Observatory Team:  "The
black-hole candidate GX 339-4 has entered its hard (low) emission
state, being detected by earth occultation beginning about mid-
September.  Its intensity has increased very gradually and is
currently at about 0.24 Crab (Oct. 17-25) in the 20- to 300-keV band.
The spectrum is very similar to the 1991 hard-state outburst (IAUC
5327), extending to at least 230 keV, with a power law index of
-2.1 +/- 0.06.  A better fit is obtained, however, with a Comptonization
model, as the spectrum becomes steeper above 100 keV.  The
Sunyaev-Titarchuk model fit parameters for Oct. 17-25 are kT = 39
+/- 5 keV and gamma = 2.5 +/- 0.5.  Identification of GX 339-4 as
the flaring source was obtained by fitting for the time of occultation
edges, yielding a 1-sigma error in location of +/- 0.35 deg
for R.A. and +/- 0.2 deg for Decl.  Monitoring of the source
intensity and spectrum is continuing."


JUPITER
     G. Orton, P. Yanamandra-Fisher, and D. Griep, NASA Infrared
Telescope Facility, report:  "Eighteen-micron images of Jupiter on
Oct. 26.68-26.78 UT show that the South Equatorial Belt (SEB) has
resumed a 150-mbar temperature equal to that of the NEB, recovering
from prior cooler temperatures which lasted about 1 yr.  Infrared
indicators at 8.57 and 4.9 microns show the SEB remaining unusually
cloudy, as it has been since early 1992.  If it behaves as in 1988-
1990, the SEB warming signals the recovery of its cloud properties
to a more typical state within 6-9 months."


NOVA SAGITTARII 1992 No. 2
     Further photometry (cf. IAUC 5633) by A. C. Gilmore, Mount
John University Observatory:  Oct. 17.42 UT, V = 12.62 +/- 0.08,
B-V = +0.21 +/- 0.08, U-B = -0.26 +/- 0.08, V-R = +1.12 +/- 0.09.


NOVA SAGITTARII 1992 No. 3
     Further photometry (cf. IAUC 5642) by Gilmore:  Oct. 24.38 UT,
V = 8.92 +/- 0.04, B-V = +0.40 +/- 0.03, U-B = -0.40 +/- 0.05, V-R
= +0.56 +/- 0.03, V-I = +0.87 +/- 0.03.


1992 November 3                (5647)            Daniel W. E. Green

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