GRB 990123 is a gamma-ray burst which was detected on January 23, 1999. It was the first GRB for which a simultaneous optical flash was detected. Astronomers...

gamma-rays. Early observations of the bright optical counterparts to GRB 990123 and to GRB 080319B, whose optical light curves were extrapolations of the gamma-ray...

than this. Gamma ray burst 990123 (23 January 1999) was one of the brightest bursts recorded at the time, and was the first GRB with an optical afterglow...

(1999). "GRB 990123". GCN Circulars. 7094: 1. Bibcode:1999IAUC.7094....1O. Bloom JS; et al. (2001). "The Redshift and the Ordinary Host Galaxy of GRB 970228"...

of the burst was approximately 1054 ergs, placing it in second behind GRB 990123. Furthermore, the gamma-ray data also suggested that the burst was beamed...

– 9 billion light-years – approximate distance to the gamma-ray burst GRB 990123 (light travel distance) 94.6 Ym – 10 billion light-years – approximate...

The first prompt optical burst from a GRB was discovered by ROTSE-I for GRB 990123. The ROTSE-III project involved four half-meter telescopes based on the...

Ferguson, DH; et al. (1999). "LOTIS Upper Limits and the Prompt OT from GRB 990123". AIP Conference Proceedings. 526: 250–254. arXiv:astro-ph/9912402. doi:10...