The first report on the Suzaku Early X-Ray Afterglow observation
Abstract
Suzaku target of opportunity observation results are presented of early X-ray afterglow observations of GRB 060105 with the Swift XRT early afterglow observation results. The bright, long gamma-ray burst GRB 060105 triggered the Swift Burst Alert Telescope (BAT) on 5 January 2006. The Suzaku team commenced a preplanned target of opportunity observation at 5.3 hour after the Swift trigger. Following the prompt emission and successive very steep decay, a shallow decay was observed. After an observation gap, an extremely early steep decay was observed in 4 - 30 ks after the trigger. The steep decay exhibited decay indices of 2.3 - 2.4. This very early break, if it is a jet break, is the earliest case among X-ray afterglow observations, suggesting a very narrow jet whose opening angle is well below 1 °. The unique Suzaku/XIS data allow us to set very tight upper limits on line emission or absorption in this GRB. For the reported pseudo-redshift of z = 4.0+/-1.3 the upper limit on the iron line equivalent width is 50 eV.
- Publication:
-
Astronomical Herald
- Pub Date:
- June 2007
- Bibcode:
- 2007AstHe.100..254T
- Keywords:
-
- X-ray Afterglow observation