GCN Circular 3508
Subject
GRB 050408: jet break in the XRT light curve
Date
2005-06-01T18:38:09Z (19 years ago)
From
David Burrows at PSU/Swift <dxb15@psu.edu>
S. Covino (OAB), M. Capalbi, M. Perri (ASDC), V. Mangano (INAF-IASF/Palermo),
and D. N. Burrows (PSU) report on behalf of the Swift XRT team:
We have analyzed the Swift XRT data from 12 observations of GRB 050408
(Sakamoto et al., GCN 3189) performed over a period of 38 days.
The [0.3-10] keV light curve shows a break at (1.2 � 0.5 )E5 seconds after
the trigger. We interpret this as a jet break, implying a jet opening angle
of 8.2 degrees, given an isotropic-equivalent gamma-ray
energy of 1.3E52 erg (Berger et al., GCN 3201).