Astronomy Picture of the Day . A GRB Host? ... 25.06.1997 . ... WFPC2 , HST , NASA Explanation: Where do gamma-ray bursts (GRBs) originate? ... 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. ... June 1997 . ...