Ga. Ct. App. R. 27
Briefs of the parties shall be limited to an appellant's brief, an appellee's brief, and an appellant's reply brief. Supplemental briefs may be filed only by leave of the Court. Counsel may file a motion for permission to file supplemental briefs. Counsel may not file a supplemental brief contemporaneously with the motion, but may include a copy of the supplemental brief with the motion for permission to file as an exhibit. Counsel shall file a supplemental brief, in compliance with the limitation on length at Rule 24(f), only after permission to file is granted. If paper filing, only the original must be filed. A certificate of service must be attached to the supplemental brief, and service must be made upon opposing counsel.
Parties are not permitted to file letter briefs. Any communication with the Court regarding recent authority which comes to the attention of a party subsequent to the filing of the party's brief or after oral argument, but before decision, must be filed in compliance with Rule 27(a) above as a supplemental brief. Any response shall be made promptly and in accordance with this rule.
Ga. Ct. App. 27