Improvement in sky-localization estimates closer to merger time. The blue histograms in the top panels show the sky-localizations obtained 15 min before the merger and in the bottom panels 5 min before the merger. The 1 min (orange) histograms show the sky-localization estimates for the same events. Re-positioning CTA within the updated (smaller) sky-localization released 1 min before the merger increases the chance of VHE detection.