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IAUC 6152: ALEXIS J1139-685; X-RAY N 1994 IN Sco; 29P

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                                                  Circular No. 6152
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)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)


ALEXIS J1139-685
     D. Roussel-Dupre, J. J. Bloch, B. C. Edwards, T. E. Pfafman,
W. C. Priedhorsky, S. Ryan, and B. W. Smith, Astrophysics and Radiation
Measurements group, Los Alamos National Laboratory; and O. H.
W. Siegmund, S. Cully, T. Rodriguez-Bell, J. Vallerga, and J.
Warren, University of California at Berkeley, report:  "Around Mar.
17.5 UT, the ALEXIS extreme-ultraviolet satellite observed the
beginning of a short-lived transient that peaked in flux on Mar.
18.0.  By Mar. 18.5, the transient was no longer observable by
ALEXIS.  The location of the transient is R.A. = 11h39m, Decl. =
-68o30' (equinox 2000.0; accuracy +/- 0o.5).  The transient was
observable in the narrow 70-eV channel (17.6 nm) but not the narrow
93-eV channel (13.3 nm).  The approximate observed count rate,
integrated over the burst duration, implies a continuum flux of
0.03 +/- 0.008 photon cmE-2 sE-1 AE-1 or line emission of 0.44
photon cmE-2 sE-1 at the 70-eV band center.  A quick search of
various stellar catalogues did not produce any likely candidates
within the error box."


X-RAY NOVA 1994 IN SCORPIUS
     C. A. Wilson, B. A. Harmon, S. N. Zhang, W. S. Paciesas, and
G. J. Fishman report for the Compton Observatory BATSE Team:  "The
x-ray/radio transient GRO J1655-40 is undergoing a major outburst
in hard x-rays above 20 keV.  Preliminary fluxes for the past
several days in the band 20-100 keV are:  Mar. 17, 240 +/- 20 mCrab;
18, 470 +/- 30; 19, 500 +/- 30; 20, 480 +/- 40; 21, 1200 +/- 50.
The source has been detectable since mid-February (IAUC 6147), but
generally at lower intensity (50-300 mCrab).  The spectrum extends
to at least 200 keV and is well fit by a power law with spectral
index varying between -2.5 and -3.1.  The spectrum tends to soften
as the intensity increases."


COMET 29P/SCHWASSMANN-WACHMANN 1
     This comet is evidently undergoing another outburst in brightness,
as indicated by the following total visual magnitude estimates:
Feb. 10.74 UT, 14.0 (A. Nakamura, Kuma, Ehime, Japan, 0.60-m
reflector + unfiltered CCD); 19.65, 14.1 (Nakamura); 24.59, 13.6
(Nakamura); Mar. 8.65, 13.7 (Nakamura); 23.17, 13.3 (A. Hale,
Cloudcroft, NM, 0.41-m reflector).


1995 March 23                  (6152)            Daniel W. E. Green

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