Details

Autor(en) / Beteiligte

• FONG, W
• BERGER, E
• PODSIADLOWSKI, P
• MARGUTTI, R
• ZAUDERER, B. A
• TROJA, E
• CZEKALA, I
• CHORNOCK, R
• GEHRELS, N
• SAKAMOTO, T
• FOX, D. B

Titel

A JET BREAK IN THE X-RAY LIGHT CURVE OF SHORT GRB 111020A: IMPLICATIONS FOR ENERGETICS AND RATES

Ist Teil von

• The Astrophysical journal, 2012-09, Vol.756 (2), p.1-12

Ort / Verlag

Bristol: IOP

Erscheinungsjahr

2012

Quelle

Elektronische Zeitschriftenbibliothek - Freely accessible e-journals

Beschreibungen/Notizen

• We present broadband observations of the afterglow and environment of the short GRB 111020A. An extensive X-ray light curve from Swift/XRT, XMM-Newton, and Chandra, spanning ~100 s to 10 days after the burst, reveals a significant break at delta t [approximate] 2 days with pre- and post-break decline rates of alpha [sub x.1] [approximate] -0.78 and alpha [sub x.2] -1.7, respectively. Our observations demonstrate that a growing fraction of short gamma-ray bursts (GRBs) are collimated, which may lead to a true event rate of [> or ~]100-1000 Gpc[sup -3] yr[sup -1], in good agreement with the NS-NS merger rate of [approximate]200-3000 Gpc[sup -3] yr[sup -1]. The consistency is promising for coincident short GRB-gravitational wave searches in the forthcoming era of Advanced LIGO/VIRGO.