Delayed Flashes from Counterjets of Gamma-Ray Bursts
Abstract
If X-ray flashes are due to the forward-jet emissions from gamma-ray bursts (GRBs) observed at large viewing angles, we show that a prompt emission from a counterjet should be observed as a ``delayed flash'' in the UV or optical band several hours to a day after the X-ray flash. The Ultraviolet and Optical Telescope on Swift can observe the delayed flashes within ~13 Mpc, so that (double-sided) jets of GRBs can be directly confirmed. Since the event rate of delayed flashes detected by Swift may be as small as ~6×10-5 events yr-1, we require more sensitive detectors in future experiments.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- July 2003
- DOI:
- 10.1086/375261
- arXiv:
- arXiv:astro-ph/0207606
- Bibcode:
- 2003ApJ...591..283Y
- Keywords:
-
- Gamma Rays: Bursts;
- Gamma Rays: Theory;
- Astrophysics
- E-Print:
- 15 pages, 4 eps figures, Accepted for publication in ApJ