Two arrests have been made after a trio of shots-fired incidents in Janesville.  Police say the first incident occurred a week ago Sunday afternoon when a 21-year-old man sustained non-life-threatening injuries in a shooting in the 400 block of South Jackson Street.  A second, apparently retaliatory, shooting happened later that evening in the Woodman’s grocery store parking lot, but no one was injured.  Police say the suspect in the South Jackson Street shooting was apprehended late Wednesday morning after being accused of taking a shot at a pursuing off-duty police officer on North Washington Street.  25-year-old Tyrone Z. Gibson of Janesville was arrested on charges including Attempted First-Degree Intentional Homicide and Felon in Possession of a Firearm.  On Friday, officers say 19-year-old Lawrence E. White of Janesville was arrested in the Woodman’s shots-fired incident and also faces a charge of Attempted First-Degree Intentional Homicide.  Police say several guns have also been recovered as part of the ongoing investigation.