Delayed Flashes from Counter Jets of Gamma Ray Bursts

Abstract

If X-ray flashes are due to the forward jet emissions from gamma ray bursts (GRBs) observed with large viewing angles, we show that a prompt emission from a counter jet should be observed as a delayed flash in the UV or optical band several hours to a day after the X-ray flash. Ultraviolet and Optical Telescope on Swift can observe the delayed flashes within ~13 Mpc, so that (double-sided) jets of GRBs may be directly confirmed. Since the event rate of delayed flashes detected by Swift may be as small as 6*10^{-5}events/yr, we require more sensitive detectors in future experiments.

15 pages, 4 eps figures, Accepted for publication in ApJ

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• A Unified Model of Short and Long Gamma-Ray Bursts, X-Ray Rich Gamma-Ray Bursts, and X-Ray Flashes
• An Off-Axis Jet Model For GRB980425 and Low Energy Gamma-Ray Bursts
• Peak Energy-Isotropic Energy Relation in the Off-Axis Gamma-Ray Burst Model
• Cosmological X-ray Flashes in the Off-Axis Jet Model
• Gravitational Wave Memory of Gamma-Ray Burst Jets
• Giant flare of SGR 1806-20 from a relativistic jet
• Possibility of Ultra High-Energy Cosmic Rays from the Giant Flare in SGR 1806-20
• First Electromagnetic Pulse Associated with a Gravitational-Wave Event: Profile, Duration, and Delay
• Prompt emission from the counter jet of a short gamma-ray burst
• Steep Decay Phase Shaped by the Curvature Effect. II. Spectral Evolution
• Gravitational Wave Memory from Accelerating Relativistic Jets in Multiple Thick Shell Scenarios