that's some BS science. as far as I know, the only way scientists could predict to any meaningful degree a GRB is if we had knowledge about star evolution to such extent that we could make accurate predictions based on observations of stars that could potentially release GRB from dangerous, but still huge distance. And I don't know how it can be more powerful than supernova if it usually caused by supernova or you can say it's a part of supernova explosion. anyway, for now we can only see if we're going to get hit by it when there's a matter of minutes before GRB comes, and it's not going to be as focused from tens to hundred light years away. if it would 'point' toward us, then it would likely cover the whole solar system or good portion of it at least.
for record, there aren't any known stars in 'danger zone' that could go supernova in foreseeable future and wreck havoc here with GRB, at least from what is detectable with current tech.
