Early Re-brightenings in GRB Afterglows as Signatures of Low-to-High Density Boundary

P. H. Tam, C. S. J. Pun, Y. F. Huang +1

The association of long gamma-ray bursts (GRBs) with star forming regions and the idea of massive stars as progenitors of GRBs are widely accepted. Because of their short lifetimes…