The NASA Swift mission has detected 500 gamma-ray bursts (GRBs) to-date.
This movie is presented as an all-sky map in a Hammer projection (Wikipedia). Each burst lights on the appropriate date and then fades to a green dot to emphasize the random distribution of GRBs on the sky.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 184.108.40.206.0