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IAUC 2729: TRANSIENT X-RAY SOURCES; 1974h; N Per 1974

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                                                  Circular No. 2729
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.

     K. A. Pounds, University of Leicester, reports: "A previously
unreported x-ray source was seen by the  Leicester sky-survey experiment
on the UK-5 satellite at R.A. = 15h24m, Decl. = -61o.7 (l = 320o.3, b
= -4o.4)   The probable error is less than 10'.  First evident on
Nov. 12, the source steadily brightened to 0.3 times the Crab Nebula
at 2-10 keV by Nov. 22.  It was still bright on Nov. 30.  The
object was possibly an x-ray nova or long-period binary."

     S. S. Holt, L. J. Kaluzienski, E. A. Boldt and P. J.
Serlemitsos, Goddard Space Flight Center, report the short-term
appearance of an intense new x-ray source observed from the all-sky
monitor aboard the Ariel V satellite.  The corners of the
90-percent-confidence error box are: R.A. = 8h22m, Decl. = +42o.7; 7h51m,
+41o.7; 7h54m,+39o.1; 8h24m, +40o.2.  The source appeared on Nov. 19.4 UT
with a total output at 3-6 keV of at least 5 x 10**-5 erg cm**-2.  It
was not detected during the orbits immediately preceding and following.
If the source were present for as long as one hour, its
minimum x-ray luminosity was 1.6 times that of the Crab Nebula.

     The following precise positions have  been reported:

     1974 UT             R. A. (1950) Decl.        m1    Observer
     Nov. 14.09495    11 16 57.58   -34 32 31.1    8.0   Hers
          14.82211    11 17 09.50   -35 04 15.7    8     Suzuki
          14.82661    11 17 09.77   -35 04 24.0            "
          15.08631    11 17 14.85   -35 15 54.8    8.5   Hers
          15.10020    11 17 14.87   -35 16 36.1            "

J. Hers (Randburg, near Johannesburg).  20-cm Celestron telescope.
   On Nov. 17.07 UT m1 ~ 9.5 visually (through thin cloud), and the
   comet was not seen on Nov. 18.1.
K. Suzuki (Asuke, Aichi). Long. = -137o19', Lat. = +35o08'.  Measurer: T.
   Urata.  From Nihondaira Obs. Circ. No. 607.

     W. Liller, Harvard Observatory, has inspected photographs of
the region and finds no evidence for an earlier outburst having
occurred between 1898.8 and 1952.8.

1974 December 6                (2729)              Brian G. Marsden

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