This picture taken with the Hubble Space Telescope of the field surrounding GRB 970228 might provide a clue. It appears to show an extended structure to the lower right of the GRB , which is identified with an arrow. Many astronomers speculate that this extended structure is a distant galaxy , as its colors and subsequent steady emission indicate. Other astronomers worry that the extended emission is variable and so cannot be a galaxy. The location of this burst was determined by an unprecedented collaboration involving the tandem use of NASA satellites Compton , Ulysses and Rossi .
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