Prompt emission from the counter jet of a short gamma-ray burst

Abstract

The counter jet of a short gamma-ray burst (sGRB) has not yet been observed, while recent discoveries of gravitational waves (GWs) from a binary neutron star (NS) merger GW170817 and the associated sGRB 170817A have demonstrated that off-axis sGRB jets are detectable. We calculate the prompt emission from the counter jet of an sGRB and show that it is typically 23-26 mag in the optical-infrared band 10-10^3 sec after the GWs for an sGRB 170817A-like event, which is brighter than the early macronova (or kilonova) emission and detectable by LSST in the near future. We also propose a new method to constrain the unknown jet properties, such as the Lorentz factor, opening angle, emission radii, and jet launch time, by observing both the forward and counter jets. To scrutinize the counter jets, space GW detectors like DECIGO are powerful in forecasting the merger time (<~ 1 sec) and position (<~ 1 arcmin) (~ a week) before the merger.

arXiv comment14 pages, 3 figures, 1 table. Progress of Theoretical and Experimental Physics (PTEP), in press

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Cited by in corpus (5)

• Spectral Puzzle of the Off-Axis Gamma-Ray Burst in GW170817
• Late-Time Afterglow from Double-Sided Structured Jets: Application to GRB 170817A
• Short duration gamma-ray bursts and their outflows in light of GW170817
• Gravitational Wave Memory from Accelerating Relativistic Jets in Multiple Thick Shell Scenarios
• The Detection Prospect of the Counter Jet Radiation in the Late Afterglow of GRB 170817A