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IAUC 5567: 1992m; SOFT GAMMA-RAY REPEATER; N Sco 1992

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IAUC number 

                                                  Circular No. 5567
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


PERIODIC COMET WOLF (1992m)
     S. Nakano, Sumoto, Japan, reports the recovery of this comet
by T. Seki (Geisei).  The comet appears nearly stellar with a faint
coma (m1 = 19.5-20 on July 10).  The following positions are in
close agreement with the prediction on MPC 14594 (the July 25 film
was taken in bad seeing):

     1992 UT             R.A. (2000) Decl.        m1
     July 10.75069    0 48 20.13   +22 15 58.0    20
          25.71875    1 04 29.29   +22 56 53.1    20
          26.69479    1 05 25.80   +22 58 11.9    20
          26.71529    1 05 27.49   +22 58 14.9


SOFT GAMMA-RAY REPEATER
     C. Kouveliotou, G. J. Fishman, C. A. Meegan, R. B. Wilson, W.
S. Paciesas, T. M. Koshut, J. M. Horack, and M. N. Brock report for
the BATSE Team:  "We have detected repeated soft gamma-ray emission
from a region centered on R.A. = 19h08m, Decl. = +11 deg, with an
average error radius of about 8 deg.  The first trigger was recorded
on June 19.74845 UT, and it consists of two pulses separated by
0.5 s.  The leading pulse had a trapezoidal temporal profile with a
rise-time of about 0.5 ms, and the second pulse had a triangular
shape.  Each pulse had a total duration of 40 ms, with FWHM of
about 20 ms.  Their spectra are among the softest of all cosmic
events detected by BATSE; they are consistent with a typical spectrum
of a soft-gamma repeater (SGR) with an upper energy cut-off of
about 120 keV.  The second trigger occurred on July 8.21941.  This
event lasted about 300 ms with most of the emission concentrated in
an initial spike that lasted < 64 ms; its spectrum was similar to
that of the June 19 event.  Our results are consistent with the
assumption that the SGR designated B1900+14 by Mazets et al. (1979,
Sov. Astron. Lett. 5(6), 343) has become active again.  Observations
of the source region at other wavelengths are strongly
encouraged. "


NOVA SCORPII 1992
     Photometry by A. C. Gilmore, Mt. John University Observatory
(cf. IAUC 5561; +/- 0.01 unless otherwise noted):  July 18.50 UT,
V = 8.88, B-V = +0.92, U-B = -0.18, V-R = +1.01, V-I = +1.66 +/-
0.03; July 20.55, 9.26 +/- 0.02, +0.90, -0.16 +/- 0.06, +1.10 +/-
0.02, +1.57.


1992 July 27                   (5567)            Daniel W. E. Green

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