Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100..254t&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 6, p. 254 - 263 (2007)
Astronomy and Astrophysics
Astronomy
2
X-Ray Afterglow Observation
Scientific paper
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.
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