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IAUC 2925: X-RAY BURSTS; A1745-36; 1976a

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IAUC number 

                                                  Circular No. 2925
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS


X-RAY BURSTS
     D. Hearn and the SAS-3 Group, Massachusetts Institute of Technology,
reports an improved position for MXB1730-335: R.A = 17h30m.2, Decl. =
-33o25' (equinox 1950.0; l = 354o.80, b = -0o.22).  The radius of
the error circle is 4'.  SAS-3 observations are continuing.

     V. A. Hughes and M. R. Viner, Queen's University at Kingston,
Ontario; and F. Argyle and P. Feldman, Herzberg Institute for
Astrophysics, report that no radio pulses have been observed in an
attempt to obtain a correlation with x-ray bursts from the galactic
center.  The relevant data are: 46-m telescope, Algonquin Radio
Observatory, wavelength 9.4 cm, half-power beam width 9', Mar. 2 and
4, observations for 6 min (time constant 1s) at each of nine points given
by R.A. = 17h30m.28 +/- 0m.48, Decl. = -33o26' +/- 6' (equinox 1950.0),
upper limit to flux density 1.14 Jy, corresponding to 6 times the rms
noise; 24-m telescope, Dominion Radio Astrophysical Observatory,
wavelength 21 cm, half-power beam width 36', Mar. 1-3, total of 8.5
hr observing (time constant 0s.1) at R.A. = 17h42m.1, Decl. = -29o28'
(equinox 1950.0) and Mar. 2, 0.5 hr observing at R.A. = 17h30m.09, Decl.
= -33o45' (equinox 1950.0), upper limit to flux density 5 Jy.


A1745-36
     P. Davison, J. Burnell and J. Ives, Mullard Space Science
Laboratory; and A. Wilson and G. Carpenter, University of Birmingham,
report the discovery of a new x-ray source designated A1745-36 at
R.A. = 17h44m.9, Decl. = -36o07' (equinox 1950.0).  The uncertainty in
position is about 2'.  The source became visible on Feb. 29.8 UT, and
the maximum count rate observed is about 250 Uhuru cts/s.


COMET BRADFIELD (1976a)
     T. Seki, Geisei, provides the following precise positions:

     1976 UT             R. A. (1950) Decl.        m1
     Feb. 23.42153     2 12 02.3    -30 47 59      11
          23.42778     2 12 03.6    -30 47 41

     Total visual magnitude estimates: Feb. 22.37 UT, 9.8 (G. Welch,
Christchurch, New Zealand, 13-cm refractor); Mar. 8.03, ~ 8.6 (J.
Bortle, Brooks Observatory, 32-cm reflector; 4' uncondensed coma).


1976 March 9                   (2925)              Brian G. Marsden

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