(S (S (BASENP (NNP Swift)) (VP (ADVP (RB first)) (VP (VBN detected) (NP (NP (NP (BASENP (DT the) (NN explosion)) (PP (IN on) (BASENP (NNP February) (NN 18)))) (PRN (LRB -LRB-) (S (BASENP (PRP it)) (VP (VBD was) (VP (VBN given) (BASENP (DT a) (NN designation) (NN GRB) (NN 060218))))) (RRB -RRB-))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD allowed) (S (BASENP (NNS telescopes) (CC and) (NNS satellites)) (VP (TO to) (VP (VP (VB watch) (BASENP (DT the) (NN event))) (SBAR (IN as) (S (BASENP (PRP it)) (VP (VBD happened)))))))))))))) (PERIOD .))