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IAUC 2938: X-RAY BURSTS; V1500 Cyg; 1974 XIV; 1975d

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IAUC number 

                                                  Circular No. 2938
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
     M. J. Coe, A. R. Engel and J. J. Quenby, Imperial College,
London, report that during Mar. 8-11 the Ariel 5 scintillation
counter detected at least three bursts of hard x-rays in the range
50-200 keV, each lasting approximately 3s.  The detector was pointing
near MXB1730-335 with an 8o radius field of view.  The energy
per burst was at least 3 x 10**-7 erg cm**-2.  These bursts correlate
with those reported by Mason et al. (IAUC 2932) but occur after a
time lag of between 12s and 50s.

     Corrigendum.  On IAUC 2932, line 9,  for  20 times  read  20 %.


V1500 CYGNI
     R. Wood, Royal Greenwich Observatory, reports that spectra and
direct plates obtained using the 250-cm telescope show no trace of
surrounding nebulosity as large as 3" across (cf. IAUC 2926).

     Further selected recent visual magnitude estimates: Feb. 15.00
UT, 10.4 (D. Costanzo, Arlington, Virginia); 21.25, 10.6 (R. Lukas,
Wilhelm Foerster Observatory); Mar. 4.25, 10.7 (Lukas); 13.41, 10.5
(W. I. Nissen, Arlington, Virginia); 25.4, 10.5 (J. Bortle, Brooks
Observatory); Apr. 4.33, 10.5 (P. Collins, Harvard Observatory).


PERIODIC COMET LONGMORE (1974 XIV)
     The following precise positions were obtained by V. M. and
B. M. Blanco with the 400-cm reflector at Cerro Tololo Observatory:

     1975 UT             R. A. (1950) Decl.         m2
     Oct.  4.07712    18 34 15.87   -48 06 59.7    19.0
           4.13007    18 34 19.92   -48 06 32.5


COMET BRADFIELD (1975d)
     The following precise positions were obtained by C. Y. Shao
with the 155-cm reflector at Harvard Observatory's Agassiz Station:

     1976 UT             R. A. (1950) Decl.
     Jan.  2.38963    12 25 23.73   +11 44 42.3
          10.35639    12 26 13.93   +12 59 55.5


1976 April 8                   (2938)              Brian G. Marsden

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