Central Bureau for Astronomical Telegrams
IAUC 5477: GALACTIC CENTER; 3C 454.3 AND CTA 102; 1992M
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Read IAUC 5478
Circular No. 5477
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
GALACTIC CENTER
I. F. Mirabel, Service d'Astrophysique, Saclay; L. F. Rodriguez,
Universidad Nacional Autonoma de Mexico; and B. Cordier, J. Paul,
and F. Lebrun, Saclay, communicate: "We report the following
results from Very Large Array observations of 1E 1740.7-2942 and GRS
1758-258, the two dominant hard x-ray sources in the galactic center
region. At 6 and 20 cm, we find that source A, which was identified
as the radio counterpart of 1E 1740.7-2942 (IAUC 5395), is actually
located at the center of an aligned double radio jet. Source B
appears as the hot spot at the end of the northern jet. The double
radio jet has a total extent of 1', and it is likely to be produced
by synchrotron emission from charged particules streaming at
relativistic velocities. The time variations of the compact radio
counterpart of 1E 1740.7-2942 (source A) are correlated with the
variations at hard x-rays observed by SIGMA. From 1991 September to 1992
February, the radio flux increased along with the enhancement in
hard x-ray activity (IAUC 5472). So far, no apparent radio
counterpart of GRS 1758-258 has been found."
3C 454.3 AND CTA 102
The Compton Observatory EGRET Team (R. C. Hartman, D. L.
Bertsch, C. E. Fichtel, S. D. Hunter, P. W. Kwok, J. R. Mattox, P.
Sreekumar, and D. J. Thompson, Goddard Space Flight Center, NASA; D.
A. Kniffen, Hampden-Sydney College; Y. C. Lin, P. F. Michelson, and
P. L. Nolan, Stanford University; E. Schneid, Grumman Aerospace
Corporation; and G. Kanbach, H. A. Mayer-Hasselwander, C. von
Montigny, K. Pinkau, H. Rothermel, and M. Sommer, Max-Planck-Institut
fur Extraterrestrische Physik) communicates: "We report the
tentative identification of two recently detected sources in the
gamma-ray energy range above 100 MeV with OVV quasars 3C 454.3 and
CTA 102. The observations were made between Jan. 23 and Feb. 6.
EGRET will have some additional exposure to this region of the sky
between Apr. 16 and 30."
SUPERNOVA 1992M IN ANONYMOUS GALAXY
J. Mueller, Palomar Observatory, provides the following position
for the host galaxy (cf. IAUC 5473): R.A. = 7h11m31s.74, Decl.
= +45 31'11".9 (equinox 1950.0).
1992 March 18 (5477) Daniel W. E. Green
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