Steve Girard

GRB 211211A and the emerging class of long GRBs from mergers

This concise review places GRB 211211A at the center of a discussion on the association between long gamma-ray bursts and kilonovae, and on the central engines capable of powering extended emission. We present the key observations, compare prompt and extended emission models, eva...

Cross-Constrained Central-Engine Diagnostics in GRB–SN Systems

This work introduces Cross-Constrained Central-Engine Diagnostics (CCD), a methodological framework for evaluating gamma-ray burst (GRB) central-engine interpretations by combining two diagnostic layers that are often treated separately: engine-space plausibility and thermal--non...

Cross-Constrained Central-Engine Diagnostics in GRB–SN Systems

This work introduces Cross-Constrained Central-Engine Diagnostics (CCD), a methodological framework for evaluating gamma-ray burst (GRB) central-engine interpretations by combining two diagnostic layers that are often treated separately: engine-space plausibility and thermal--non...