Speaker
Description
The all-sky monitoring capability of Fermi GBM makes it ideal for finding transients. Fermi GBM triggers on events such as gamma-ray bursts, soft gamma-ray repeaters, X-ray bursters, solar flares, and terrestrial gamma-ray flashes. A previous systematic search in offline data for X-ray bursts has uncovered untriggered gamma-ray bursts, and currently there is a dedicated offline search pipeline looking for weak transients overlooked by the onboard trigger conditions. The untargeted search looks for significant background-subtracted signals in two or more detectors at various timescales in the continuous data, detecting ~80 additional short GRB candidates per year. Since July 2017, these candidates have been published in GCN under Fermi-GBM Subthreshold transients notices, accompanied by localization maps and lightcurves. At present only short GRB candidates are published, expansion to long GRBs and other transient types are forthcoming.
