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IAUC 3506: 1980 QA; X-RAY BURSTS

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                                                  Circular No. 3506
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

1980 QA
      C. Torres, Department of Astronomy, University of Chile,
communicates the following observations of a fast-moving asteroidal
object near 1979 BA (cf. MPC 5453):

     1981 UT          R. A. (1950) Decl.     Mag.
     Aug. 16.19895   21 40.1     -13 27       15
          18.24964   21 38.0     -15 05       15

     M. Oda and the Hakucho Team, University of Tokyo, report: "The
Hakucho burst monitor has recorded seven x-ray bursts from what is
almost certainly GX 3+1.  The bursts, observed during July 19-Aug.
18, are all from within 0o.5 of GX 3+1, as determined with the
coarse-pitch rmc system.  In two bursts for which the fine-pitch
rmc was useful the bursts were found to be from within 3' of GX 3+1.
The burst peak flux is ~ 1 Crab.  The persistent flux level of GX
3+1 has been observed to vary from ~ 70 to 200 Uhuru since Aug. 7."

     Oda and the Hakucho Team also communicate: "We found the
following two new x-ray bursters near the galactic center while
surveying the galactic center and rapid-burster region since mid-July:
(1) two bursts on July 15d12h26m and 22d11h52m UT from presumably
the same source located at R.A. = 17h32m, Decl. = -30o.3 with an
error-circle radius of 0o.5; peak intensities at 3-10 keV were ~ 1.2 Crab
for both bursts; (2) four bursts since early August from R.A =
17h45m, Decl. = -24o.8 with an error-circle radius of 0o.5; one of the
bursts was located at R.A. = 17h45m +/- 2m, Decl. = -24o.8 +/- 0o.1; peak
intensities at 3-10 keV were 1.0-1.2 Crab.  No x-ray sources have
previously been reported at either location.  Persistent components
of each source have intensities below 0.2 Crab."

     J. Grindlay, Harvard-Smithsonian Center for Astrophysics,
informs us that the locations reported in the previous paragraph are
consistent with those of the globular clusters Terzan 1 (R.A. =
17h32m35s, Decl. = -30o26'.3, equinox 1950.0) and Terzan 5 (R.A. =
17h45m00s, Decl. = -24o45'.9, equinox 1950.0).  He also points out that
Terzan 11 appears to be a misidentification of Terzan 5 (cf. Terzan
1971, A. & Ap. 12, 477).

1980 August 20                 (3506)              Brian G. Marsden

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