GCN Circular 230
A. Connors and R. M. Kippen, for the CGRO-COMPTEL Rapid Burst Response collaboration; and S. Barthelmy and P. Butterworth, for BACODINE/GCN, report the following: CGRO-COMPTEL observed GRB 990123 to be extremely bright in its ~MeV energy range. The >0.7 MeV emission rose about 18 seconds after the initial BATSE trigger at 9h 46m 56.12s U.T. and lasted about 46 seconds, for a 10 sigma detection, despite its very large zenith angle (59 degrees). An initial detection notice was sent about 10 minutes after burst onset. Improved skymaps and light-curves for the full 0.2-30 MeV range have now been posted at the CGRO-COMPTEL Rapid Burst Response web-site: http://wwwgro.unh.edu/bursts These are still considered preliminary as our standard energy calibration is not yet complete. This message can be cited.