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IAUC 5616: 1E 1740.7-2942; N IN NGC 1313?; 1992q

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                                                  Circular No. 5616
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)


1E 1740.7-2942
     B. Cordier, Service d'Astrophysique, Saclay; M. C. Schmitz-
Fraysse, Centre d'Etude Spatiale des Rayonnements, Toulouse; and R.
Sunyaev and M. Gilfanov, Space Research Institute, Moscow, report
for the Granat SIGMA team:  "The SIGMA telescope has observed the
region of the Galactic Center on Sept. 14-15 for a total exposure
live-time of 46 660 s.  The soft gamma-ray source 1E 1740.7-2942
has been detected at a flux level of 97 +/- 12 mCrab in the band
40-150 keV.  The source flux appears to be increasing with respect
to the 1992 April SIGMA observations, though it has not yet
attained the 1990 March/April level.  Conversely, the source GRS
1758-258 remains in its low state, since it has not been detected
with a 2-sigma upper limit (40-150 keV) of about 25 mCrab."


NOVA IN NGC 1313?
     J. M. Chapman, R. P. Norris, and J. E. Reynolds, Australia
Telescope National Facility, CSIRO; and P. te Lintel Hekkert, Mount
Stromlo and Siding Spring Observatories, report that this nova/
supernova candidate (cf. IAUC 5615) was unresolved with the Parkes-
Tidbinbilla Interferometer at 1.6 GHz from an observation taken in
1992 May, giving an upper limit to its diameter of 0".1.


COMET HELIN-LAWRENCE (1992q)
     Orbital elements from MPC 20775:

     T = 1993 Mar. 11.131 TT          Peri. = 266.293
                                      Node  = 194.882   2000.0
     q = 2.09993 AU                   Incl. = 107.139

1992 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept.25     1 36.77   -27 57.4   1.974   2.849  144.2   11.9   14.5
     30     1 28.38   -31 06.5   1.947   2.812  143.0   12.4   14.4
Oct.  5     1 18.96   -34 10.5   1.933   2.776  140.2   13.3   14.4
     10     1 08.62   -37 05.3   1.931   2.740  136.2   14.6   14.3
     15     0 57.50   -39 47.1   1.940   2.705  131.3   16.1   14.3
     20     0 45.82   -42 13.1   1.961   2.670  125.9   17.6   14.2
     25     0 33.84   -44 21.5   1.991   2.636  120.3   19.0   14.2


1992 September 23              (5616)            Daniel W. E. Green

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