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- W3100706779 abstract "We compute the probability of detecting long gamma-ray bursts (GRBs) at z≥ 5 with Swift, assuming that GRBs form preferentially in low-metallicity environments. The model fits both the observed Burst and Transient Source Experiment (BATSE) and Swift GRB differential peak flux distributions well and is consistent with the number of z≥ 2.5 detections in the 2-yr Swift data. We find that the probability of observing a burst at z≥ 5 becomes larger than 10 per cent for photon fluxes P < 1 ph s−1 cm−2, consistent with the number of confirmed detections. The corresponding fraction of z≥ 5 bursts in the Swift catalogue is ∼10–30 per cent depending on the adopted metallicity threshold for GRB formation. We propose to use the computed probability as a tool to identify high-redshift GRBs. By jointly considering promptly available information provided by Swift and model results, we can select reliable z≥ 5 candidates in a few hours from the BAT detection. We test the procedure against last year Swift data: only three bursts match all our requirements, two being confirmed at z≥ 5. Another three possible candidates are picked up by slightly relaxing the adopted criteria. No low-z interloper is found among the six candidates." @default.
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- W3100706779 date "2007-09-01" @default.
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- W3100706779 title "On the detection of very high redshift gamma-ray bursts with Swift" @default.
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- W3100706779 doi "https://doi.org/10.1111/j.1745-3933.2007.00345.x" @default.
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