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IAUC 3854: TRANSIENT X-RAY SOURCE NEAR 4U 1543-45; NOVALIKE OBJECT IN Lib; SN IN NGC 5746; MXB 1730-335; 1983j

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                                                  Circular No. 3854
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758

     Y. Tanaka and the Tenma Team report: "The transient source
monitor on the Tenma satellite detected a bright, transient, x-ray
source on Aug. 18 at R.A. = 15h48m +/- 4m , Decl. = -47deg5 +/- 1deg0.
The location is consistent with that of 4U 1543-45 (R.A. = 15h43m50s,
Decl. = -47deg33'6, equinox 1950.0; 50" error radius; Matilsky et al.
1972, Ap.J. 174, L53), which has not been identified in optical and
radio observations.  The source, which is increasing in intensity
at a daily rate of ~ 0.1 times the intensity of Sco X-1, was half
as bright as Sco X-1 (0.5-3.7 keV) by Aug. 21.  Tenma will
continue to monitor the source: optical observations are urged."

     J. Maza, Department of Astronomy, University of Chile, telexes
that L. E. Gonzalez found a novalike object, of mpg ~ 9.0 on
Aug. 10.1 UT, at R.A. = 15h16m58s03, Decl. = -24deg49'35"7 (equinox
1950.0)  It was fainter than mpg = 18 on July 13.1 and on many earlier
plates, including those of the ESO B Survey.

     R. P. Kirshner, University of Michigan, reports that
spectroscopic observations of this object (cf. IAUC 3841) on Aug. 5 by
W. P. Blair and M. W. Johns at the McGraw-Hill Observatory show
that it is a type I supernova then roughly one month past maximum.

MXB 1730-335
     G. Pollard. N. White, P. Barr and L. Stella, European Space
Agency, have independently reported the Rapid Burster to be active
(cf. IAUC 3852).  EXOSAT observations on Aug. 7 and 15 (for 2 and
24 hr, respectively) show a persistent flux of ~ 50 mJy.  Type 1
bursts recurred at an average interval of 80 min, but no type 2
bursts were seen.  On Aug. 15 the ratio of the persistent to the
time-averaged burst flux was 50.

     Total visual magnitude estimates by J. Bortle, Stormville, NY
(0.32-m reflector): Aug. 15.34 UT, 12.5; 16.34, 12.4.

1983 August 22                 (3854)              Brian G. Marsden

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