Long vs short GRBs

• Rsep≈2 G2n c Dt ;

• Rb= c Gn tb = 8 1015 cm

• Rd= 1.3 1017 E1/353 G2(- 2/3) n0(- 1/3) cm

• Long : Rb<Rsep<Rd

• Short : Rsep < Rb<Rd --> refresh shocks and no b heating

Notes: