Fig. 1
Exposure map of BAT in Galactic coordinates from January 2005 to September 2014. Green diamonds (blue circles) are all FREDs with unknown (known) z. They jointly constitute S1. All green diamonds are sample S2. Crossed green diamonds are those unknown-z FREDs with a unique detected peak (sample S3). The three sets include 181, 119, and 71 GRBs, respectively.
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