Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3174: BRIEF X-RAY TRANSIENT; OBJECT SCHUSTER

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 3173 SEARCH Read IAUC 3175
IAUC number 

                                                  Circular No. 3174
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     Telex: 921428
Telephone: (617) 864-5758


BRIEF X-RAY TRANSIENT
     L. J. Kaluzienski, J. L. Robinson-Saba, E. A. Boldt, S. S.
Holt, J. H. Swank, P. J. Serlemitsos and R. E. Rothschild, Goddard
Space Flight Center, report the detection of a transient x-ray
event in quick-look data from the A-2 experiment on HEAO-1.  The
source, located within an error box with corners at R.A. = 5h21m, Decl. =
-53o.6; 5h22m, -54o.2; 4h39m, -57o3; 4h36m, -56o.8 (equinox 1950.0),
is clearly present in the four high-energy (1-60 keV) detectors
(soft x-ray detectors off) during a scan of this region on ~ Feb.
9d20h24m UT.  The lower limit to the flux (2-20 keV) is S0 = 0.14
Crab, with no major variations (1s.28 integrations) evident over the
1-min scan duration.  Concurrent observations of this region with
the Ariel 5 all-sky monitor yield an upper limit of ~ 1.0 Crab
(1.5-hr average) in the 3-6 keV band.  The source is not visible (S <~
0.05 S0) in A-2 scans occurring on ~ Feb. 9d01h24m and 11d02h12m UT.
Preliminary wide-band spectral color ratios indicate a spectrum
similar in hardness to that of the Crab Nebula with no significant
low-energy (E <~ 3 keV) absorption.  The present limit on the duration
of the event (2 days >~ t >~ 1 min) is intermediate between that of
the x-ray bursters and the 'weak, high-latitude' transients.


OBJECT SCHUSTER
     H.-E. Schuster, European Southern Observatory, reports the
following semiaccurate and approximate positions of a fast-moving
asteroidal object discovered with the 100-cm Schmidt telescope.
Computations by the undersigned suggest it is of Apollo type.

     1978 UT             R. A. (1950) Decl.        Mag.
     Feb.  8.2152     10 29 12.4    -27 59 07      17
           8.2777     10 29 09.4    -27 56 48
           9.23263    10 28 48.7    -27 22 57
           9.29513    10 28 45.6    -27 20 39
          10.19167    10 28 23.4    -26 45 18
          10.25417    10 28 20.9    -26 42 46
          11.15694    10 27 58.8    -26 04 42
          12.14653    10 27 24.4    -25 18 38
          13.28611    10 26 44.7    -24 20 35
          14.28125    10 26.1       -23 25.5
          15.20521    10 25.5       -22 30


1978 February 17               (3174)              Brian G. Marsden

Read IAUC 3173 SEARCH Read IAUC 3175

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!