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IAUC 6867: 1SAX J0544.1-710 = RX J0544.1-7100; NEW X-RAY BURSTER; GRB 980329

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                                                 Circular No. 6867
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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Phone 617-495-7244/7440/7444 (for emergency use only)


1SAX J0544.1-710 = RX J0544.1-7100
     F. Haberl, W. Pietsch, and M. D. Filipovic, Max-Planck-
Institut fur Extraterrestrische Physik, Garching, communicate: "The
position of 1SAX J0544.1-710 (IAUC 6861) is consistent with that of
RX J0544.1-7100.  This ROSAT source is included in a list of
variable x-ray sources resulting from a systematic study of the
ROSAT PSPC pointed data of the LMC region (Haberl and Pietsch 1998,
to be submitted to A.Ap.).  The best ROSAT position is R.A. =
5h44m06s.3, Decl. = -71o00'50" (equinox 2000.0; estimated 90-
percent-confidence error 8").  The source shows variations by at
least a factor of 11 on timescales of years between four ROSAT PSPC
and HRI observations.  Given the variability and hard ROSAT
spectrum, it is suggested as a high-mass x-ray binary candidate,
probably a Be/x-ray binary in the LMC.  A likely optical
counterpart in the x-ray error circle is MACS J0544-710#002 from
the Magellanic Catalogue of Stars (Tucholke et al. 1996, A.Ap.
Suppl. 119, 91)."


NEW X-RAY BURSTER
     J. M. Muller, BeppoSAX Science Data Center, Rome, and Space
Research Organization of the Netherlands (SRON), Utrecht; M. J. S.
Smith, BeppoSAX Science Operations Center (SOC), Rome, and SRON; G.
D'Andreta, SOC; A. Bazzano and P. Ubertini, Istituto di Astrofisica
Spaziale, CNR, Rome; and J. in 't Zand and J. Heise, SRON, report:
"An x-ray burst has been detected with Wide Field Camera 1 on
BeppoSAX on Apr. 2.2714 UT from R.A. = 18h06m48s, Decl. = -24o35'.9
(equinox 2000.0; error radius 4').  The burst had a peak intensity
of 0.6 Crab in the energy band 2-9 keV and a duration of 15 s.  No
persistent emission was detected above an upper limit of 8 mCrab
from Apr. 1.08 to 2.37 UT.  The only catalogued x-ray source within
the error circle is the transient 2S 1803-245 (Jernigan et al. 1978,
Nature 272, 701), which is not known to be a burster."


GRB 980329
     Corrigendum.  On IAUC 6866, last line, for
ftp://astro.chicago.edu/pub/astro/GRB/."  read
ftp://astro.uchicago.edu/pub/astro/GRB/."

                      (C) Copyright 1998 CBAT
1998 April 7                   (6867)            Daniel W. E. Green

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