Study of the Ultra-Long GRB 220627A: Exploring a Possible Blue Supergiant Collapsar Origin

Ayush Garg, Amit Shukla, Dorottya Szécsi +1

Ultra-long gamma-ray bursts (ul-GRBs) challenge standard collapsar models because their extreme durations require central engines active for $\sim 10^3-10^4$ s. While the prompt…