Fig. 1.
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Time evolution of the background-subtracted PICsIT light curve of GRB 202909A in the energy range 200 − 1200 keV. Each time bin was integrated over 500-ms to increase the statistics and avoid empty time bins. The dashed line corresponds T0 = 13:17:0 UTC, when the precursor was clearly detected by IBIS-PICsIT. The inset shows the precursor with 200-ms time resolution.
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