Gamma-Ray Imaging of the Galactic Center Region
The Caltech imaging γ-ray telescope was launched by balloon from Alice Springs, NT, Australia and performed observations of the galactic center during the period 12.62 to 13.00 April 1988 UT. The first coded-aperture images of the galactic center region at energies above 30 keV show a single strong γ-ray source which is located 0.7±0.1° from the galactic nucleus and is tentatively identified as 1E1740.7-2942. If the source is at the distance of the galactic center, it is one of the most luminous objects in the galaxy at energies from 35 to 200 keV.
Additional Information© 1989 by the IAU. We acknowledge the important contributions to the development of the GRIP telescope made by W. Althouse, D. Burke, A. Cummings, M. Finger, J. Weger and the personnel of the Central Engineering Services at Caltech. We thank the personnel of the National Scientific Balloon Facility and the NASA Wallops Flight Facility for their excellent balloon launch support. This work was supported by NASA grant NGR 05-002-160.
Published - 1989IAUS..136..581C