Original sentence: As with other gamma-ray bursts, this hybrid blast is likely signaling the birth of a new black hole.Following this stroke of luck (position, time, most appropriate instruments), astronomers were able to study in detail this Type Ibc supernova with the Hubble Space Telescope, the Chandra X-ray Observatory, the Very Large Array in New Mexico, the Gemini North telescope in Hawaii, the Keck I telescope in Hawaii, the 200-inch and 60-inch telescopes at the Palomar Observatory in California, and the 3.5-meter telescope at the Apache Point Observatory in New Mexico.This GRB is recognized as a type of cosmic explosion called a hybrid gamma-ray burst
Edited sentence: Following this stroke of luck (position, time, most appropriate instruments), astronomers were able to study in detail this Type Ibc supernova with the Hubble Space Telescope, the Chandra X-ray Observatory, the Very Large Array in New Mexico, the Gemini North telescope in Hawaii, Gemini South in Chile, the Keck I telescope in Hawaii, the 1.3m PAIRITEL telescope at Mt Hopkins, the 200-inch and 60-inch telescopes at the Palomar Observatory in California, and the 3.5-meter telescope at the Apache Point Observatory in New Mexico.No supernova was seen following this event (and GRB 060505 to deep limits) leading some to speculate that it represented a new class of progenitors.Others suggested that these events could have been massive star deaths, but ones which produced too little radioactive 56Ni to power a supernova explosion