Number 125 (Story #2), April 22, 1993 by Phillip F. Schewe and Ben Stein ASTROPHYSICAL GAMMA RAY BURSTS COME IN TWO FORMS , according to Don Lamb of the University of Chicago who examined 200 of the 600 or so bursts recorded so far by the Gamma Ray Observatory. In one class (25-33% of the sample) the bursts are relatively short (less than 10 seconds), faint, rapidly varying in intensity, have relatively "hard" spectra (much of their energy is above 300 keV), and are uniformly distributed in space. For the other class, the bursts are faint and bright, long (between .3 and 1000 seconds in duration), softer, less variable in intensity, and not uniform in distribution. Lamb said that he expected his new classification scheme to help in the effort to determine the origin of the mysterious bursts, none of which has yet been correlated with a known object in the sky. (APS meeting.)