Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63..735i&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.63, No.4, pp.735--739
Astronomy and Astrophysics
Astronomy
(Stars:) Gamma-Ray Burst: General
Scientific paper
In the Swift era, two-component jet models were introduced to explain the complex temporal profiles and the diversity of early afterglows. In this paper, we concentrate on the two-component jet model: the first component is the conventional afterglow, and second is emission due to late internal dissipation, such as late-prompt emission. We suggest herein that the two-component jet model can be probed by the existence of two optical peaks for orphan GRB afterglows. Each peak is caused by its respective jet as its relativistic beaming cone widens to encompass the off-axis line of sight. Typically, the first peak appears at 104-105s, and the second at 105-106s. Furthermore, we expect to observe a single, bright X-ray peak at the same time as the first optical peak. Because orphan afterglows do not have prompt emission, it is necessary to monitor the entire sky every 104s in the X-ray regime. We can test the model with orphan afterglows through the X-ray all-sky survey collaboration, and by using ground-based optical telescopes.
Inayoshi Kohei
Tsutsui Ryo
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