GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73

A short burst from SGR 1E 1841-045 / Kes 73 was triggered during the routine on-ground search of GECAM-B data, which was also triggered by Swift/BAT (GCN #37222). According to the GECAM-B light curve in 40-300 keV, this burst mainly consists of a short pulse with duration of about 0.2s. The time-integrated spectrum of GECAM-B data can be fitted by the cut-off power-law function, with the energy fluence about 4.38e-07 erg/cm^2 in 40-300 keV. GECAM-B localized this burst to the following position (J2000): Ra: 274.51 deg Dec: -0.97 deg Err: 3.71 deg (1-sigma, statistical only) This GECAM-B localization is consistent with the Swift/BAT on-board localization (GCN #37222). Please note that all GECAM results here are preliminary. The final analysis will be reported. Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).