FLIRT update: Rapid radio observations of GRBs

Mathematics – Logic

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Unidentified Sources Of Radiation Outside The Solar System, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest, Radio, Microwave

Scientific paper

The Fallbrook Low-Frequency Immediate Response Telescope (FLIRT) is a phased radio array located in Fallbrook, CA which is remotely operated from Princeton, NJ. The experiment is designed to detect prompt radio counterparts of gamma-ray bursts (GRBs) at 74 MHz. Observations are triggered by the BATSE locations distributed through the GRB Coordinate Network and begin ~10 s after BATSE detects a GRB. FLIRT is capable of detecting a 100 Jy source in a 10 s integration. A prompt radio burst at 74 MHz would follow a GRB by up to 30 minutes for bursts at cosmological distances. Thus, for cosmological GRBs, FLIRT can probe the pre-GRB radio emission. With even a crude second estimate of the GRB source distance, the dispersion measure can be used to estimate the column density of ionized hydrogen in the intergalactic medium.

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