TY - JOUR AU - D. Lazzati AU - Mitchell Begelman BT - The Astrophysical Journal DA - 08/2009 DO - 10.1088/0004-637X/700/2/L141 PY - 2009 SP - L141 EP - L144 T2 - The Astrophysical Journal TI - Polarization Signature of Gamma-Ray Bursts from Fragmented Fireballs VL - 700 SN - 0004-637X ER -