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IAUC 2983: X-RAY BURSTS; 1975 YA; 1950 LA

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IAUC number 

                                                  Circular No. 2983
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
     F. Li and W. H. G. Lewin, Massachusetts Institute of Technology,
report that the SAS-3 Group has observed x-ray bursts from MXB
1837+05 (IAUC 2963) and MXB 1906+00 at positions R.A. = 18h37m.6, Decl. =
+ 5o04' and R.A. = 19h06m.2, Decl. = + 0o09' (equinox 1950.0), respectively.
The error radius is ~ 10' for both sources.  The bursts come almost
certainly from Ser X-1 (3U 1837+04; for its position see IAUC 2820)
and A1905+00.  For the latter source R. Doxsey obtained an improved
SAS-3 RMC position R.A. = 19h05m56s, Decl. = + 0o06'14" (equinox 1950.0;
error radius 1').  One burst was detected from a third source
located between 0o.8 and 1o.7 from R.A. = 19h08m.2, Decl. = + 2o.3.


1975 YA
     The following precise positions have been obtained by H.-E.
Schuster, European Southern Observatory, with the 100-cm Schmidt
telescope.  Measurer: R. M. West.

     1976 UT             R. A. (1950) Decl.
     July  3.13043    17 40 23.24   -44 11 58.3
           3.13736    17 40 19.94   -44 12 29.0


1950 LA
     The following precise positions have been reported:

     1976 UT             R. A. (1950) Decl.        Observer
     Jan.  5.31130     9 50 34.49   -27 51 08.0    McCrosky
          27.33501     9 24 10.45   -31 32 25.0    Roemer
          27.36071     9 24 08.02   -31 32 31.3      "
     Feb.  3.39097     9 13 16.60   -31 46 26.2      "
          25.27141     8 41 56.46   -29 29 20.4      "
          25.29768     8 41 54.56   -29 29 02.4      "
     Mar. 25.16118     8 24 54.03   -22 33 41.6      "
          30.12847     8 25 15.26   -21 19 22.7      "

R. E. McCrosky (Harvard College Observatory, Agassiz Station).
   155-cm reflector.  Measurer: C. Y. Shao.
E. Roemer (University of Arizona).  Steward Observatory's 229-cm
   reflector on Jan. 27 (D. Daniels assisting), Feb. 25 and Mar. 25
   (C. A. Heller assisting); otherwise Lunar and Planetary Laboratory's
   154-cm reflector.  Measurers: Roemer, W. Smith, C. Vesely.


1976 August 12                 (2983)              Zdenek Sekanina

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