Fermi/GBM sub-threshold triggers, when cross-checked with GECAM, yield 49 confirmed transients including 41 short GRBs, implying the short-GRB rate may be nearly twice the triggered-only rate.
Cross calibration of gamma-ray detectors (GRD) of GECAM-C
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abstract
The gamma-ray detectors (GRDs) of GECAM-C onborad SATech-01 satellite is designed to monitor gamma-ray transients all over the sky from 6 keV to 6 MeV. The energy response matrix is the key to do spectral measurements of bursts, which is usually generated from GEANT4 simulation and partially verified by the ground calibration. In this work, energy response matrix of GECAM-C GRD is cross-calibrated with Fermi/GBM and Swift/BAT using a sample of Gamma-Ray Bursts (GRBs) and Soft Gamma-Ray Repeaters (SGRs). The calibration results show there is a good agreement between GECAM-C and other reasonably well calibrated instrument (i.e. Fermi/GBM and Swift/BAT). We also find that different GRD detectors of GECAM-C also show consistency with each other. All these results indicate that GECAM-C GRD can provide reliable spectral measurements.
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Extending the short gamma-ray burst population from sub-threshold triggers in Fermi/GBM and GECAM data and its implications
Fermi/GBM sub-threshold triggers, when cross-checked with GECAM, yield 49 confirmed transients including 41 short GRBs, implying the short-GRB rate may be nearly twice the triggered-only rate.