Not OSINT, but the BBC and the guardian going over some of the evidence:
https://www.theguardian.com/world/2023/oct/18/al-ahli-arab-h...
https://www.theguardian.com/world/2023/oct/18/al-ahli-arab-h...
Headline" "AP Visual Analysis: Rocket from Gaza appeared to go astray, likely caused deadly hospital explosion"
https://apnews.com/article/israel-palestinians-hamas-war-hos...