Short answers, pulled from the story.
François-Joseph Carbon constructed the specific infernal machine for this attack on Napoleon Bonaparte. This Italian engineer originally designed such weapons during the Siege of Antwerp in 1585.
The explosion occurred on 3 Nivôse Year IX of the French Republic which corresponds to the 24th of December 1800. The blast happened at 8 P.M. when Napoleon was traveling to the Opéra.
Napoleon exiled 130 Jacobins from France without trial or right of appeal on the 4th of January 1801. Four daggers conspirators named Giuseppe Ceracchi Joseph Antoine Aréna François Topino-Lebrun and Dominique Demerville were guillotined on the 10th of January 1801 while Chevalier was executed on the 11th of January 1801.
The teenage girl Marianne Peusol who held the mare for twelve sous was killed by the blast. No other fatalities are recorded in the provided script text regarding this specific event.
Georges Cadoudal served as the leader of the Chouannerie movement and ordered the assassination attempt. Pierre Robinault de Saint-Régeant and Limoëlan were charged with taking Napoleon's life under his command.