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IAUC 3606: 4U 0515+38; 1981d; 1979k

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IAUC number 

                                                  Circular No. 3606
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


4U 0515+38
     P. Ubertini, A. Bazzano, C. La Padula and V. F. Polcaro, Istituto
di Astrofisica Spaziale, Frascati, telex:  "We announce the detection
of hard x-rays (15-150 keV) from the region of the soft-x-ray
source 4U 0515+38.  The measurement was performed by means of a
balloon-borne xenon-filled mulitiwire spectroscopic proportional
counter with geometric area 27 m**2 and a spectral resolution of 13
percent at 60 keV; the limited passive tin-copper collimator had a
full-width-at-half-maximum field of view of 5o x 5o.  The balloon
was released on 1980 Aug. 10 from Milo, Sicily, and reached a ceiling
altitude corresponding to 3 mb.  An excess flux corresponding
to the transit of a point source, located near R.A. = 5h16m, Decl. = +38o,
was detected.  The spectrum detected was deconvolved and the best
fit found by standard procedures.  The minimum chi**2 corresponds to a
power law dN/dE = k exp (-A), with k = 3.1 + 3.8 - 2.3, A = 1.56 + 0.44 - 0.32.


COMET BUS (1981d)
     Ephemeris continuation from the elements on MPC 6050:

     1981 ET     R. A. (1950) Decl.     Delta     r      m1
     May  26    13 23.91    - 1 53.0    1.739   2.561   16.3
          31    13 06.99    - 1 17.3
     June  5    12 52.02    - 0 48.5    1.888   2.533   16.4
          10    12 38.97    - 0 26.5
          15    12 27.74    - 0 10.6    2.077   2.509   16.6
          20    12 18.17    - 0 00.3
          25    12 10.07    + 0 05.0    2.284   2.490   16.8
          30    12 03.28    + 0 06.1
     July  5    11 57.63    + 0 03.4    2.497   2.475   16.9

          15    11 49.15    - 0 11.1    2.704   2.465   17.1
          25    11 43.57    - 0 35.2
     Aug.  4    11 40.15    - 1 06.7    3.072   2.459   17.3
          14    11 38.26    - 1 44.0
          24    11 37.46    - 2 25.8    3.344   2.473   17.6


PERIODIC COMET SCHWASSMANN-WACHMANN 2 (1979k)
     Total visual magnitude estimates by C. S. Morris, Harvard, MA
(0.25-m refl.): Feb. 10.18 UT, 12.0; Mar. 2.07, 13.0:, 28.20,
12.5.


1981 May 26                    (3606)              Brian G. Marsden

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